第1篇：四年级四则混合运算练习题700题

(1)1533÷73+159-57=

(2)83×91÷131+38=

(3)197-46+67-13=

(4)1512÷54×126-52=

(5)192+52×136÷66=

(6)123-47+159-16=

(7)164×23-126+74=

(8)117+21+17-19=

(9)81÷9×161+93=

(10)93×35-128+36=

(11)86×9+87×99=9387

(12)2324÷83-108÷54=26

(13)3348÷93+15-17=34

(14)51+1414÷14-90=62

(15)42+31×180+42=5664

(16)17×25-2050÷82=400

(17)552÷12×18-66=762

(18)1118-18÷2×109=137

(19)916-952÷17×5=636

(20)1044÷29-540÷45=24

(21)23+15+925÷37=

(22)52+770÷22-22=

(23)88×51+800÷40=

(112-13)×(103-12)=

(25)56×7-66÷22=

(31)(151+49)÷(7+93)=

(32)32÷(56÷7)×18=

(33)199-(21+70)-22=

(34)14×5÷(34-33)=

(35)840÷(125-90)+67=

(26)109×66-29×10=

(27)339+55-166-52=

110÷55×102÷51=

(29)71+42×50-92=

(30)92÷4-194÷97=

124-(170-48)÷61=

(37)2058÷98-(86-66)=

(38)(76+485)÷51+91=

(39)(91-22)÷69+27=

(40)(50+20)×88÷56=

(41)1157÷(128-39)×54

(42)18×58+(73-17)

(43)757-7168÷2÷64

(44)98-98×12÷14

(45)80×12÷15-64

(46)298-15×15-1

(47)128+2184÷42-66

(48)73×(66+34)-21

(49)75×3+768÷24=

(50)71-51+199-83=

(51)161-8+33×2=

(52)182÷71÷82-9=

(53)141+5+144×12=

(54)193÷20÷123÷55=

(55)142÷50×169+36=

(56)132+70×156÷38=

(57)108×21-83×55=

(58)122×9+62+58=

(59)53÷40×81÷71=

(60)28+53-11-25=

(61)107-4-26-33=

(62)112÷82×122-81=

(63)174-4×101-61=

(64)77÷59-103-33=

(65)171+56÷55÷73=

(66)121-56-110×67=

(67)86×22-59+9=

(68)185÷79×189-80=

(69)28÷33÷151×54=

(70)4×96+132×5=

(71)72-20-87-67=

(72)158+56×124+31=

(73)113-35×194-3=

(74)119+19+194-34=

(75)112-77÷17÷39=

(76)102-78÷65×1=

(77)154×17×167×98=

(78)120×88÷2÷48=

(79)88-22×179-78=

(80)25+86×67+55=

(81)184×81+151-69=

(82)165+21÷164+85=

(83)181÷32+4÷87=

(84)31×72×89×11=

(85)134+82+126÷92=

(86)109×82+184÷37=

(87)71×36+25-20=

(88)128-75-185+32=

(89)36+22-175+97=

(90)109-87-70×45=

(91)141+12×71÷78=

(92)21-87÷111×35=

(93)19×53×77-61=

(94)22+4÷127-97=

(95)71-87×75÷17=

(96)116÷48-125÷86=

(97)117+79×116÷13=

(98)2+45-161÷38=

(99)44×40-68×38=

(100)121+49+183×99=

(101)59+54+71×29=

(102)108-77×80÷55=

(103)139÷99×180+94=

(104)41÷30÷139+43=

(105)78+79+24×39=

(106)94÷17×89+89=

(107)138-43÷44÷89=

(108)182÷81-152÷30=

(109)103+10+156-21=

(110)17×29×95×33=

(111)124+98-191+77=

(112)152÷45+77×27=

(113)168÷48+149÷3=

(114)34×28÷103÷25=

(115)75×45+50×60=

(116)55-11÷70÷49=

(117)3÷47÷184×61=

(118)200+81÷20×56=

(119)75÷10-155-90=

(120)98×19-188+63=

(121)38+10+141+27=

(122)72÷5+53÷68=

(123)105÷71-136+73=

(124)188-60+187×83=

(125)6-89×3÷77=

(126)106÷62×107-51=

(127)44÷57-125÷60=

(128)131÷75÷122-76=

(129)138÷89+51+39=

(130)59×71-188÷46=

(131)76+46+152×54=

(132)32-56+152×57=

(133)165÷62-65÷91=

(134)186×95×4+43=

(135)81×67÷149+10=

(136)99×41×130+92=

(137)118-12-128+62=

(138)44-52-160÷82=

(139)39×96×147-28=

(140)37-23+15÷96=

(141)128÷90×19×30=

(142)89-7×162+55=

(143)34-63+77-64=

(144)53+41+62+36=

(145)27×3+22÷23=

(146)78+73+17+2=

(147)45÷45÷172×20=

(148)53+85-27÷26=

(149)146×99×116×18=

(150)66-19÷31-14=

(151)154-70-161×49=

(152)44÷98÷166+31=

(153)116-85×183-44=

(154)10-59+11+30=

(155)143÷18+76×55=

(156)130+70-37×69=

(157)68-14-4×80=

(158)166÷59÷61-43=

(159)92×16÷49-90=

(160)120×40-95÷5=

(161)34×87-61×53=

(162)90+35+190÷91=

(163)183÷40÷110÷58=

(164)118×99-96×52=

(165)145+58×135×42=

(166)39÷52÷103-68=

(167)97÷22÷192×12=

(168)132+90×96÷79=

(169)33÷32-107+73=

(170)169×26×5×13=

(171)15-37+124+54=

(172)67×2+53÷1=

(173)27+59÷158+27=

(174)136+22÷5-15=

(175)19÷15×39÷38=

(176)130-74×21×82=

(177)161÷44÷170+31=

(178)97-56+106×17=

(179)90-33-168+68=

(180)27×98-158÷39=

(181)164÷39+123÷62=

(182)106×93-17÷8=

(183)109+19-42+95=

(184)164÷17×120÷37=

(185)68+49+99÷49=

(186)122×51-144+29=

(187)57-52÷91÷25=

(188)48÷17-62×92=

(189)5×26+80÷71=

(190)200-93-191+71=

(191)15÷61-48÷9=

(192)84-42×42+69=

(193)6+72×147×55=

(194)97-36+167×75=

(195)165+22-144-50=

(196)179-81÷14×85=

(197)1×42-80×79=

(198)68+45-176-31=

(199)189-64÷110-2=

(200)140×76+37×5=

(201)23×39-161×72=

(202)69÷36+26+80=

(203)66×65÷177-67=

(204)72÷18×65÷43=

(205)2×15+171+12=

(206)158÷74×22×12=

(207)80×54+76×1=

(208)182×45-156×66=

(209)169-72×192÷26=

(210)90×75+171÷68=

(211)10-8÷39÷4=

(212)176+49÷65×90=

(213)57×67×5×93=

(214)122×6+179-39=

(215)138-55-197+29=

(216)60×71×48-80=

(217)96-99×91+42=

(218)10÷80+52+65=

(219)45+74+181+81=

(220)140-2-62-53=

(221)17-25÷31×49=

(222)10+65-96÷37=

(223)13-93×123+14=

(224)23÷81+164+72=

(225)52×45×107+44=

(226)78×75-119+95=

(227)23÷90÷53-29=

(228)16-1÷108-55=

(229)132-14-99+5=

(230)71+76-25+32=

(231)155+93×103×79=

(232)123÷1÷153+66=

(233)88÷33+90-58=

(234)145+84+21-85=

(235)192÷80+104+68=

(236)52÷71×53-22=

(237)51×57-60-83=

(238)155-65×14×47=

(239)15÷80-188÷49=

(240)9×53×65÷87=

(241)53+89+90+9=

(242)59÷33×10÷58=

(243)4×70-186+26=

(244)99-37-146-79=

(245)25×81÷162×12=

(246)113×56-115×9=

(247)42÷78+28×50=

(248)130-64+151+61=

(249)198×38÷158-22=

(250)73÷47-135÷39=

回答人的补充2009-07-2210:13

(251)108+84×146÷27=

(252)7÷25÷37+51=

(253)104×12-57-15=

(254)194-74×176-41=

(255)86-14÷72-7=

(256)138-59÷61+13=

(257)173÷6×142÷21=

(258)34×51+45×54=

(259)155÷47+37÷95=

(260)27÷58-177÷62=

(261)137×72+194÷17=

(262)49+45÷48÷69=

(263)197×11-171+44=

(264)81+62+44×66=

(265)28×16÷94-32=

(266)195+70-192×28=

(267)193÷84-107÷56=

(268)7×62÷16+39=

(269)176+87+23÷43=

(270)127×92+182×20=

(271)25×94-175×86=

(272)10-98+150×47=

(273)12-93×63-79=

(274)3÷29×24÷85=

(275)74-21×7×36=

(276)198-62×2÷6=

(277)68+84+195+19=

(278)79-43÷26÷15=

(279)21÷89×134-59=

(280)176÷94+30-80=

(281)176×64+99+88=

(282)110÷52÷193×51=

(283)47×81÷186+58=

(284)50-84÷188×86=

(285)66+86×158÷68=

(286)154÷21-31÷82=

(287)34×22+97-87=

(288)27÷73+133+90=

(289)170+53×53÷84=

(290)166×65+147+50=

(291)162+90-96×49=

(292)13×52+21-8=

(293)18+19×164÷17=

(294)2÷50×47×45=

(295)114+16÷114+96=

(296)14+61×109+4=

(297)43×84-173÷92=

(298)20+92+137×8=

(299)69+74×185-33=

(300)137×90-153×93=

(301)175×6+62÷89=

(302)74÷58+124×29=

(303)111×96×37×11=

(304)187-82+9×44=

(305)46+84÷111-37=

(306)122×61÷14×49=

(307)19-58×103×34=

(308)71-26+34-69=

(309)187÷74+102+13=

(310)20+67÷112÷59=

(311)75-88+114-55=

(312)196-62-83×36=

(313)28÷77+116-43=

(314)123×93×26+99=

(315)60×65÷101×78=

(316)67-81+113÷60=

(317)103÷48+134×9=

(318)89÷5-61+61=

(319)56-18÷196×55=

(320)91÷26×180÷6=

(321)41+88-38-36=

(322)72-16×24-83=

(323)44÷22×29×90=

(324)174÷83-40×90=

(325)174+52+9×5=

(326)131×93×21+58=

(327)105+8-133-36=

(328)122+97×150-78=

(329)133+42÷127×41=

(330)20÷54+58×26=

(331)20×53×137+95=

(332)42+57-66÷85=

(333)49÷12×175-25=

(334)196+61-41-76=

(335)71÷85-174+23=

(336)139÷3-44+77=

(337)155+64+34-82=

(338)16-31×178-51=

(339)38÷83÷74÷19=

(340)120-26÷40×70=

(341)180+52÷84-93=

(342)136÷30+173÷41=

(343)4÷74×170÷39=

(344)192÷67÷111÷30=

(345)156-78÷7÷85=

(346)111-73÷34×86=

(347)149÷37÷91×85=

(348)60×17÷13+70=

(349)15+97+185×37=

(350)198+26÷66+76=

(351)154-1÷170+12=

(352)130+15×2-59=

(353)187+11÷98-75=

(354)154÷5×76×54=

(355)1+41-38+20=

(356)110-53÷34÷11=

(357)4×73-128-79=

(358)34+75+169-9=

(359)172×87×26÷64=

(360)5÷71÷166-90=

(361)98÷86-156÷77=

(362)195-52×153×80=

(363)46×19×165+47=

(364)121×60×154+15=

(365)199+5-164+46=

(366)94+1÷134÷61=

(367)106×62+186÷22=

(368)66-61÷54÷49=

(369)138-30+32+16=

(370)85+38×117÷91=

(371)133×95×121×91=

(372)144+64+22÷10=

(373)48×17÷141÷62=

(374)26-30÷9÷60=

(375)8+48÷101×11=

(376)162+10÷115÷60=

(377)159-67÷174÷16=

(378)74÷89×17÷10=

(379)112×96÷156÷80=

(380)27×88÷88-19=

(381)2÷34+111+53=

(382)83÷85×46-31=

(383)127÷70×20+54=

(384)145+42+199÷49=

(385)8÷22-34×3=

(386)10×31×102×62=

(387)34×47-122+36=

(388)21×60×3+67=

(389)110-81×123÷42=

(390)112-93+93×96=

(391)113-55÷194+78=

(392)63×82×157-40=

(393)138÷19-60×1=

(394)145÷87-24-73=

(395)147÷72-67×85=

(396)176+2-16+81=

(397)23+85×27-56=

(398)166÷79÷1-83=

(399)17÷26÷73÷9=

(400)167÷57+38+58=

(401)197+84+104÷36=

(402)129×83÷31-68=

(403)103÷95-42×52=

(404)142×40×178÷85=

(405)191×69-74÷19=

(406)92×66÷20-17=

(407)87×9÷106÷69=

(408)108+90-93÷29=

(409)36×43-16+33=

(410)11-44×175+71=

(411)151×44×97-62=

(412)169-98-138-5=

(413)64÷58+112÷56=

(414)142÷81×1+22=

(415)175×29+144-84=

(416)134÷7÷171-77=

(417)105×19÷44+17=

(418)42÷94-104-9=

(419)141-41+81-40=

(420)107×4÷147+63=

(421)91-78÷193-92=

(422)166×49-192÷22=

(423)130×10÷37-81=

(424)96+32×123+27=

(425)53×38×40×12=

(426)71-60×69÷4=

(427)123×13+45-11=

(428)6-80×54+86=

(429)123-53+166÷53=

(430)13×94+44×44=

(431)2-77-35-83=

(432)44+90-198×5=

(433)131-26÷52-44=

(434)148÷66×121×82=

(435)148-83+38+99=

(436)116+53×110×99=

(437)9÷9÷81-62=

(438)133÷41-7+12=

(439)41-57÷187×15=

(440)28+8+46×35=

(441)189-6÷132÷38=

(442)124÷36÷108+70=

(443)64÷78+112-32=

(444)87+46+164-28=

(445)200-70÷188+47=

(446)177-16-130÷50=

(447)98÷74×144+3=

(448)98×9÷118×42=

(449)76+5+129+18=

(450)48-96-81+91=

(451)123×23×115÷32=

(452)168×85×66÷95=

(453)146÷62÷138-30=

(454)194÷43+65÷85=

(455)22+52÷155+71=

(456)104×18+64÷52=

(457)43-46×94÷11=

(458)171×71+90-71=

(459)174×41×97×25=

(460)11×96+67÷28=

(461)97÷9-179×37=

(462)35-47÷61÷41=

(463)62-17÷72-45=

(464)96-61+132×89=

(465)140÷55×75÷39=

(466)142+86÷185÷35=

(467)67-58×110÷35=

(468)65×4÷16×51=

(469)102-36-163+93=

(470)149÷54+168-43=

(471)70×93÷143×49=

(472)124+63+175+78=

(473)16×57-124÷30=

(474)12÷65×16+7=

(475)53×1×2÷88=

(476)179÷31-164+88=

(477)12+69-139×25=

(478)186+87+35×17=

(479)96-7÷18+9=

(480)37+48-40×45=

(481)122×77+90×8=

(482)30-35×33÷13=

(483)180-91+23÷11=

(484)5-5×160×65=

(485)77×33×157÷55=

(486)197÷73+114÷85=

(487)188+82×148-48=

(488)87÷42+179×14=

(489)108×40-23×96=

(490)46÷20+85÷76=

(491)100+56+25+25=

(492)191×50÷55×8=

(493)146÷52-68÷10=

(494)32÷37+53+76=

(495)198×44+183×94=

(496)123-69-42÷11=

(497)24×71+173+22=

(498)111+43-24+24=

(499)62×21÷56+58=

(500)188÷91×98+39=

(501)71×51×120+13=

(502)140÷4-104÷13=

(503)175+17×173÷70=

(504)194÷55×78÷59=

(505)119÷95×190+10=

(506)74+33×99÷80=

(507)116÷10÷167×34=

(508)47+53÷139×86=

(509)99+56÷165×90=

(510)171-96-115+20=

(511)169-27+168×2=

(512)152×25+137×85=

(513)44÷37+125-83=

(514)186-12-159-70=

(515)113+48-7-77=

(516)16+61+29-72=

(517)83÷91-52×67=

(518)176÷42-137×24=

(519)30-99-17÷14=

(520)45+4+70÷14=

(521)48-23+27×70=

(522)96÷5-56+19=

(523)101÷60-27+14=

(524)146×41+17+24=

(525)71+82-31×69=

(526)4+65×21+48=

(527)8+58+170+31=

(528)124+16÷126×69=

(529)182÷75×146-92=

(530)55+39-38+51=

(531)132-71+77×68=

(532)87÷17×154÷65=

(533)114÷54÷152×19=

(534)106×90+15÷19=

(535)154+28+79×78=

(536)40-85×156+77=

(537)96÷21÷132÷77=

(538)112+37+157×92=

(539)55-7+7÷65=

(540)89×14÷89+22=

(541)61×31-66÷44=

(542)131÷43+170×61=

(543)116×35-192-82=

(544)41÷40-9×63=

(545)40+85+35-48=

(546)117-25-61÷66=

(547)120×91×66+31=

(548)2×56÷73×18=

(549)163×38÷22÷67=

(550)129×48+136+98=

(551)146÷4÷160÷66=

(552)178+3÷136-51=

(553)63-91×106+31=

(554)121×28+1+99=

(555)177+50×105×89=

(556)76-69÷155×78=

(557)70÷1+70×16=

(558)151-31-163÷58=

(559)93+59-32+55=

(560)101÷98÷186×66=

(561)16×67÷194-50=

(562)174+71×28÷16=

(563)77-9-173×66=

(564)161÷79+185+30=

(565)32×44÷60×13=

(566)46-16÷101+63=

(567)8×27×59×75=

(568)60÷53÷10-34=

(569)149+35÷149+32=

(570)125÷78+190+41=

(571)68-91-122-85=

(572)106÷11+14×94=

(573)98×92×42×84=

(574)65÷27+200÷40=

(575)139-31+91×50=

(576)105+91+56-78=

(577)111+21÷21÷99=

(578)24+76÷138+99=

(579)2-23×200+72=

(580)163+87÷92+1=

(581)119×71-66-55=

(582)57-91-110×12=

(583)138÷96-178+6=

(584)86÷39×177×26=

(585)153÷49+60+79=

(586)122-88+122+17=

(587)128÷29×57-53=

(588)181+36÷68÷70=

(589)145÷6÷183+50=

(590)73×33×80×6=

(591)54×49+169×67=

(592)53×20+21+1=

(593)125×46÷117-95=

(594)68÷41-192×18=

(595)96×34-145÷51=

(596)9÷80+192-31=

(597)25÷21÷42×94=

(598)162+77-162+45=

(599)137-13+115+58=

(600)56-58-38×27=

(601)76×36×40×74=

(602)112×58-198-28=

(603)157×63-112-92=

(604)99÷45÷115÷6=

(605)10÷42×93÷13=

(606)175+49×5+56=

(607)37-14+66+6=

(608)144-81+79÷32=

(609)57+43-81÷39=

(610)105÷65×190+70=

(611)159-42×8×2=

(612)99-57-86-21=

(613)150÷92÷186-30=

(614)161÷72÷58+62=

(615)5-76×71÷33=

(616)169÷13+193×38=

(617)118×93-89+16=

(618)97+86×17+72=

(619)154×94×85-4=

(620)60×39+155+99=

(621)94-99-172÷72=

(622)170×73+173+90=

(623)89-25÷181-66=

(624)180+77÷30÷72=

(625)109÷13+114+29=

(626)137-49-131+57=

(627)191×46-191×24=

(628)33×18+173×69=

(629)93-86×99-63=

(630)53×77÷198÷64=

(631)141-86-46+30=

(632)26×2-41×58=

(633)79×24-7×4=

(634)75+75÷181÷51=

(635)120+23+177×87=

(636)66÷18÷190÷54=

(637)197-78×19+29=

(638)59÷8-185+10=

(639)10÷84÷115+49=

(640)159+9-76×22=

(641)79÷53÷16+65=

(642)162-91÷16-78=

(643)192÷48-92×18=

(644)10×63-55-78=

(645)55×2+181×92=

(646)39+91×182-50=

(647)146+43÷39÷48=

(648)27-24×183×87=

(649)158×26×193÷39=

(650)47×23-88÷65=

(651)55+48-187÷42=

(652)115÷80÷18-67=

(653)119+79÷35÷81=

(654)42-51+40×13=

(655)199-89×68×53=

(656)81×73÷15+81=

(657)167×66÷187+49=

(658)181÷93×45×35=

(659)161×47+112×84=

(660)31-93÷130×46=

(661)36-39+31-20=

(662)119÷15+9×21=

(663)20÷47-51-88=

(664)172×81÷19×27=

(665)156÷99+48÷21=

(666)13×30÷139÷13=

(667)159+69÷117+69=

(668)8×28-40+39=

(669)59-3×20+32=

(670)119÷5×140+1=

(671)58×42-40-79=

(672)148+73+48÷50=

(673)175×51-27×79=

(674)193÷55×18+25=

(675)99÷42+51÷22=

(676)96×8×199-73=

(677)36×97+51-43=

(678)92-47÷81-76=

(679)163-98÷82-51=

(680)60+73÷149-75=

(681)73+45÷172÷50=

(682)172÷95×133-95=

(683)31÷88÷165×68=

(684)145+59+56+71=

(685)18-48+173-78=

(686)89+67×83+72=

(687)185÷41+30+28=

(688)158÷7+174×28=

(689)101÷8÷135-57=

(690)200-76-135÷49=

(691)5-34×109+32=

(692)5÷7÷61×59=

(693)55×78÷39×63=

(694)160+89×196+16=

(695)174×95-132÷35=

(696)92×99×173-33=

(697)109×63×165×26=

(698)125÷22-72+12=

(699)72×5×132+39=

(700)126-75+65÷62=

第2篇：四则混合运算练习题

四则混合运算是小学数学的基础教程，想要学好数学，基础是关键，下面小编为大家搜索整理了四则混合运算练习题，希望能给大家带来帮助!更多精*内容请及时关注我们应届毕业生考试网!

一、计算下面各题

90×12-800252÷4+3786×25+1850

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468÷6+278145×28+107905×32-1800

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200-15×8200+16×7200-150÷5

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900+105×83250-595÷7396-25×6

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(200-15)×8(200+16)×7(200-150)÷5

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(900+105)×8(3250-1150)÷7(396-36)×6

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90×(12-8)405÷(4+5)86×(25+1850)

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468÷(569-563)145×(28+107)905×(32-18)

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85+125+5087805-85-627824+631-31

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285-25+5086205÷5×3624×31×56

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441÷7÷982×14÷4824÷2×6

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简便计算

1、选出出能运用乘法分配律的算式

570×24+56×76012+(32+176)

57×24+57×76100÷(25+20)

570×24+57×760(40-25)×80

570×24+56÷825×10+4

125×8×125×225×(6×8)

76+99×76

76+124×32

2、选出能简便计算的算式

28.36-12.75+6.428.36-12.75-6.4

28.36+12.75-8.36350×(12+38)

42+(123-42)79×53+47

475-(63-25)42+(126-42)÷3

1.2023三年级上册数学混合运算练习题

2.五年级《整数、小数四则混合运算》同步练习

3.四则混合运算练习题

4.2023年小学数学二年级下册混合运算应用题

5.新人教版二年级下数学混合运算应用题

6.小学四年级数学下册人教版《四则运算》习题练习

7.指数与指数幂的运算练习题

8.除数是整数的小数除法练习题

9.四年级数学小数部分练习题

10.五年级《除数是整数的小数除法》同步练习

第3篇：四年级数学《整数四则混合运算》练习题

作为一名小学生，要想学好一门课就必须大量反复地做题，我们精心为大家整理的四年级数学整数四则混合运算练习题，希望可以帮助到大家的学习!

1、指出下面各题的错误，并改正。

3.6÷(0.4-0.04)+0.12×(7.5+2.5-7.5+2.5)

=3.6÷0.036+0.1=2×(10-10)

=100.1=0

2、用递等式计算。

4.6÷(1.8+0.5)×5.14.8÷(4.2-1.8)×0.7

119÷(42.5×1.6÷3.4)42.41+34.5÷(14.75-12.25)

3、把下面的分步算式列成综合算式。

0.96×5=4.39-0.42=8.58

15.6÷13=1.22.4+11.9=14.3

4.3-1.2=3.18.58÷14.3=0.6

综合列式综合列式

4、用递等式计算下面各题，除不尽保留两位小数。

90.6÷(100×0.52)+20.552.4÷13.2-(4.5-1.6)

[(20+0.92÷0.4)-1.1]÷0.55×[(3.2+4.06)÷6.05]]

5、在下面的○里填上“>、<或=”。

6.7+3○3.7×30.9÷1.5○0.9×1.5

9.99÷0.01○999×0.010.21×0.21○0.21÷0.21

6、6.5与3.5的和,乘以它们的差,2、8个0.125加上0.25除8的商,积是多少?和是多少?

7、某机床厂计划全年生产机床480台，实际提前三个月完成全年计划的1.2倍。平均每个月生产多少台?