四年级册下数练习题小、一脱计算式能简，算的要算简。7.81.×+30.9481-8.2×04.5×2046.×.04.5×1.3+209.38×41.-38.4+（04）.2.×5027×.38.+.072×62.29×10..012.7510×-27.510×04.63×.2053.62×25.+7.36×24.3702.54×8.×47188+2..6+362.41.09-35.4-4726.595.9（-959.12+7.）825.6(0.-2+53.)-617.73.71-54(.756+4.8)7.832.3+-408.36.+66.3282+.90.+1+981..5930.19++.28125.84(-(.4-0.592)30.-0.387-.6231.65-1.-15.68-72.73+2.7-7.3+..27484.2.7++81.5-6.782304.0.+81-.347-.2.488+.36+.2+0.537.35+2.2671+7.5.21+379+.0.7+15.1358.4-1.-3.8122.44-35(874+19..4)475.4.+8-65.71.-0.5342-47.13.57(3-7.5+.486)13.45-.6482+.554.787-4.58.+26.8-435+6..8949.89-.+8.861.2-5.863.-541.6+70.56+.23401.342.6++0.867.54.9-6.+33.4+51.9+70.56.4588+.6+303.7.71+6.44+0.3335.5641.76-8-6.6-8.45-21.2023.+3.44-0.2360.+32.61.9+3807.-.0381-.26.5+479-6.5.6.3-8.9-3.688.382+5.19+0.579324.-.801+.433+2.9-8.6412.+39.7+27.1.53+09.4+290.692.-5-416.52+1.06511+.346.9-8788-13..6二、简便的能简便要计算。12.×5.8×28.203×.4＋10.2×8.36.0215×8（＋0.8）00.40×16.2.×51 5.×10617.8599×.115×991＋.516.2×101－1162.54×07.8＋5.57.×2.887+.×208.1.03×2.4×50.4.21×1514×0×8.893.×.5＋8793.3.×＋83.934.2810×2.7×0.04+60.70.×54.5-6.443+734.85.67（15-.-4.3）825.-415（3+.77）.3.6－.2183＋.09.83-0.4-617.3225.-60.2(3+56)-..177137.-(54.57+648).783+2.3.4-08.+6.663.8322+9.+0.8+91.125.48-(9(.-4.52)350.-61.-85.617.-2.593+.190+.218.732+.-7.3+727.35+.+203.370.7-0.3-8.6124.842+7.+58.160-.873.420+.-83.1-472.4.88+6.12.73+.90+.3+71.51.548-.8-3.1212.344(-58.7419.4+47.)+5.8-46.513.5-4468.2.553+.2+257.61+.517.753(3-.7+654.)8.71-40.3-52.7474.-87.5+842.368-..546+9.894.-98.6+.8851.26.--3.485345.+1.9+0765.3.45+1.970+65.176+0..5+3.64201.3+2.466+08.75.+.49-6.348.+586.+03.371.7+63.440.35+36.54-.176-.6683.5+1.47+0.6597.54+.96.-523.4+3.-40.2360.+236+1..98.37-0.380-.16263.8-.9-3.6883.82+5.17+9.0953.240-.8+1.4312.+93.+2.7721+01.6511+3.2+349-8..65.9+0349+.2.069-24.5-.156一、乘法交换律2abca bc0.25×.5×8142.×5.069×08.0.5×2.07×34.05×2162×4.二乘结法合律（a）cabc（）b.36×41.528×0.5×9.0524×35×0.×0.250.575××00.4、三乘法配分律(ab)cacbc1.2(5－.1205×)（802－）40×2.5(2+04)×.5、乘四法分律配应用逆abcaa(bc)1（2+2.5）50.×8.723×3.＋5.682×.51356.2.×－11.5×611..833×.54＋6.338×.445.09710×.－8.0×87.90275×..737.－×35.73.×297.＋39.7.×3106×0..53－9.×6.30576×..80＋.2×70.6、五其把一中个因数成分两个数和的差，再按或乘法分律配08.×01.010.79×99.85×1099.63510×.146.0.×90.6×5011.8×10.14.3×16200.3×91998.9×.01103.×2403.365×0.1108.×5.990.6×1510、六分因数拆1.252×5.×3232.×0.251×.2
50.253×652×.448.8×.152七、加添因数“1”65.×59956.＋597.99×9＋.7.2×94＋492.5.41×1-.543 .178×9.90.18712.7＋×99.1.27＋、八改因数的更数小点位置6.6×633+66.6×6.7645×＋23×876.4×8.87＋8×70.52314.0×68.3＋1.4×.003201×1.8070.-9×871365×..7－36.540×37.2.×361+23×23+..32341×.003＋431.×4.7231－4.0×.1551.×30×0.232×1.25045.×995×10.13.021×56129.51×0825.×7.3×04.5×24150－2.×145×158＋.55×15.84.2.6.×1＋3.5494.×2.99×92.22＋.333×.343、直三接得写数3.82=×100×.=713.9×0=0.8510×0=5.5×=118×0..5=32.×3=13.1×0.3=008×1.25=.25×4=.2.5×=8.500.2=×0.60.1×=07×0..=825.8×0×=125×0.=8.8×2=3100.×=71.3×9=508÷1000=.55×=11.×085.=3.2×3=131.×0.=0.0381.×2=525.4×=2.58=×05.×0.20.=×06.=10.7×.08=25.8××0=125×0.8=四竖式计算、.820×7.=310×.15=0.9×30.6=0.38×00=67.05×.4=2.064×.9=7983×.7.6=065.×400=.053×18=4.61×8.=9045×.42.=0.37×.231=4 3.8×.1200=5.7×.60=6.4×0.=567.×5.=9.88×3.8=78×..64=.64×.72=4.×52.7=×1.65=30.×6=31×.2=6.7×.6=754×..7=8.623×6.=.35×.1=78.3×2.=614.0.7×=4.×52.8=.7×4.2=66.21×4.=5.4×26=..3×124=3..71.×=84.×5.32=5.2×.613.6=×.8=0.606×.416.=5×.8=50.27×0.9=40.4×2.082=.204×019.=.4×213.0=72.0×.2=0.77×083.=20.6×50.40=0.23×.01=0.29×061.5=01.×06.1=94×12=.74.×66=×0.37=.208×.27=00.7×504.2=.2×3.91=8×06.=42.7×0.=8104×.=2.1×379.=.43×1.4=26×..1=60.80.3×=0.560.×=0.9410.6×=1.×186=.4.8×0.=5.3×02.=49.8×48.=1×2.8315=2.×.6=5201.11.×1=13.3×10.42=6.3250×.4=86.35×.=1.8×3.67=41.3×.34=1.5×.04=510×42.=2.4×372.=4298×0..5=656.41×.87=80.×209.=871.3.9×=.82×1.139=21.534.67×=.726.45×=1.65×3.35=7.961×.54=6×10.7=2.067×.498=5×.014=09×..5=0.4×2.75=20×7.6=2.×91.=2×43.3.7×1.==75.240×.8=.5×725. =.224.3=×52×..82=5.×2.5=31.×15.63=5.×12=.8×5.4=4.75.×4=.173.8=×12.3.×=69.5×71=7.8.1×.=6.1×344=4..×4.14=.843×.4=69×2..5=4.1×88=.7.4×.63=.51×38=.3.×1.56=9.6×.1410=4×.=21.23.8=×9.6×.14=7.8×1.=2.692×1.=69×.2.=52.5×7.=823.×=568.×.2=2.22×.5=59.×6.1=208×.0.2=3.1×624=.4.7×.5=3.8×12.2=73.2×.7=73×2..76=2×3..=70.45×.05=672.×0.4=2.2×4.39=.57×.2=5.08×40.2=507×0..5=.02×30.7=48.36×.=30.8×02.=54.35×.065=.03×2.01=60.3×0.555=087.0.×=8.02×40.08=.90×02.3=7.410×6.=36×.42.=0.72×.4086.=×8.3=721.×3.=40.4×2.06=6.302×068.=28.×72=0.65.0.19=×3.9×0.21=325×.56.=4025×..047=.82×00.8=7.18×24.=04.50×.81=.4×0.16=802×1..80=.3×0.772=83×.2=.8×9.48=32.×=42.×8.9=0129.×0.8=5.1×1.0=81×0.03=8.9×.9=46.8×07=.80.72=×66.×3.=46.×1.4=132.×0.8=
7.3×6.2=.87×.6=312.×3.70=0.8×.92=4.×179=..1×3.59=1.40×.6= 6.38×.4=6.0×67.54=49.0.1×=.54×32=.18×..90=6.5×.0=510.×56.=57.×5.50=0.7×8.20=8128.2×.89.6×2=3.=3.8×.10=2.0×8.080=1×074=7.5.3×.2=.04×0258=.0.8×.10=255×0.4=..282.6×=1.×407.=2.×5.46=0.×9.5=867.2×6=..275×.9=8.73×6=.5.9×2.48=62.9×41=.9.×167=..23×10.=28.6×.49=1.32.0×3=.469×7.12=1.56×22.4=35.×1.5=0.25×07.=4200.7×=84.84.2×=.78×.0308=5×.25.=.7×35=49.×17=..134×.0=80.20.0×9=3.×1.440=68.×042.7=82×7..=22×.70=529.×=104.×8052=..185×.1=.087×.204=0.8×01.=8.089×.025=10.98=×.09×.01=1×.08=4.5×4=.65×4=57×3..3=1×4.406=6×.=6.95×.72=10.55×=五列、式算计1、甲数。是15.4，2比乙多7.数6，乙是数多？少2、358．加7上.805与.1差，的和多少是六？解决问题、。1小红用、02元钱文具买，买钢用笔6.7去元，买具文盒用9去.8元还剩下，少多钱？2、爸爸用两长条度分别是1.27、米.351米的子接起来捆扎绳报。纸口处共用接去绳子0.52米接好，的绳子后有长多？7 3、一桶油连共重1桶265千克.，去一用半，连桶还后重685.克千，来的桶里有原油多少克？千二减法、的巧算中1.减法性的质a：--c=ba（b-+c）算巧面各下：①题03-70-237②7.42-3(4.2+1.)5③7423-7（3＋1298）三、加减混式的巧算合1去括.号和添括的号法则只有加在减算的算式运里，如括果号前是面＋”“，则不论号掉去括或添号括上，括号里面号的算符运号都不；如果括号变前是“面-号，”则不去掉论括或号添上括号，号里括面的算运号都要改符变，+“变”“”-“，-”“+变”即：，a＋b＋c＋d（＝a＋b）c＋＋da-（b＋ad＋＝a）b--c-ad（b--）＝c-b+ca2.符带“搬号”家32＋45-615＋524325=-15＋426+45=3（251-2）5（+4＋546）=20+1000＝300注意每个：前面数运算符号是这的数的符个号.如46，+-12，5+4.而5235前虽面然有没符号，应作是看+25。3.找“基3准数法几个”比接较近于某整数一数相的时，加选这整个为数基“数准”。计算78+6＋78＋82377+80＋＋97＋58二、简用方便计法：算53+6（514+644+）495588264＋＋418986＋93548＋74569945（99-5480）-87102-80-502425029-4＋9448-1782+122-74642-45＋59+9455337-（54-313）-65797+（3742-44）75-27小乘法数简的运算便一、法交换律与乘合结律运的。提用示1：以计下中算，的需有把一个小要数成拆两数相个乘要，注意拆后两分8数 相乘大的小该应原数与相等，特别小是数位的。数如3.2=08×4.3.20.=4×80.2=3.040×80.23=008×.546.=.8×075.6=.0×870.560=.0×780.560.=8×700.8=401.×240.8=040.412×示提2：应乘用结合律法解的题
口诀是连乘用合结提示：应3乘用结合律解法题的格是式ab××ca=×(bc×最)一后个步是骤“”×不，要成是“+看.”如.2×05.482=.50.×40×21=0.×11=2.214.5×60.×2.452.51×2.7×0.812.×3.520.×252.5×.0481.5×5.625×02.36乘法配分的运律用。提示1：A组中的一因个数都备一具特个，点都接整近数、101、100，等这样的数就可拆分成两以个数相加者相或减。10如.=（1040+4.9.9）(1=0-0.)9.90=(9100-.10)但也这有样数的.8=8（8+.804.）=(440.4)0.+84(0.=4+.00)8提示2：用乘法应分律解配的口诀是题乘加乘用分减配示提3：用应乘分法配律题解格式的是（a+）bc×=×ca+×bc最后个一步骤是+“”，不要看是成“×.”如.5×0248=2..5×0(.+4.08)=2.05×.0+42.×0508.1=+.02=12.不是=1+02.=2提4示：应用法乘配律解题分的后最一步，时是数有比较字大的个两相数减，口算容易加错出这，时要打就草稿竖计式算。.05×1204.1.25×8.989×0..53.3×1.78－.2×17.9857.0.×8＋623×0.2.－0828×2.1.80×＋1908.9 较乘比结法律与合分配在律简便算运的时别。区下面各题两种方用法算简。215.×8.812.5×.880.5×248.0.5×2.48二、一变变，简能算。8×40.6＋544×.084我试来一：试0.2793×430.＋567×297196.表上面来，左右两边看有相同的因没数，能不用使法分乘律配。.260×451＋296×04481..169×1.5－300.35×三、拓提展高。99.99×0.＋18.1112.8×3140×.403＋.14×7.3231－.4×.105小数法除的便运简算小数法的简便计算除整与除法的数便计简一样，算用到的是法除性质。除性法质1A÷、÷BC=A÷B(×C)如42÷：2.8=42÷0（7.4×）=42÷0.7÷46=÷40=15：42如02.÷54÷=240÷（.254×）=20÷40=412除性法质、2(ab－)c=÷a÷cb÷c－除法性质、3A(÷B÷C)=A÷B×C除性法4、质A(B×÷C)=A×B÷C小乘数法的递等除计算式数乘除小的递等式法计方法算与整的一样数，简便的能简便，要也有的但是能简不便如：3比6+6.4.0.5不能掉×先进加后乘陷的里。阱3.65+1××5.46能掉不进用乘应法分率配的阱陷。里1073. 8－.641－3.8－1.365668.－6.86－1.634.052×162.×43.2×375＋6.28×3.5.368.3－9.－6.125.84－9.4－0.(52)4.87.8×＋8×0.72536×10.264×..20＋356÷4.2＋3.4－90.49.84－8×.0.(5.15－2.105)28×.4×801.106.55×.995＋.65709×1.0.－08.87×.094.0＋25.＋0.4895.7－1.813－.21.357－3.(7＋5.46)8368＋..75－2.686.87＋2534.－08.54＋66.5.36－1.81－56－7.2..38＋2.2＋09.18＋9.1.96＋4.－8.63.17－405.32.－74.25＋7.268－0.6＋1.63631.5－3.684＋2.654.787－.4+58.80.938+0.36+.364157.+3.55－095.+9412.52.45－6.(071＋13).4.÷235.30÷1.22÷851876×9..＋91876.3.5÷22.÷504..78÷40.23.4＋3.49
－41＋..6－1590..4÷9141..52×.52×32.630.－×263.6×15.10.6－33.×6.8015.20÷.5÷2411 56.3÷59.6.0÷8÷0..44.299＋×.24.80910×0114..5－(63＋462.5)71.8÷1.7(84×)5.832＋4×.27(45.9－237)÷.÷081.2597.×9＋9.97.46×123.5×85.6×11.3115.－615.－×2.1606.5101×2.5×7.7－375×3..8.75÷24.5÷043..3×485.＋36.385×4.46480975-＋045394×893640875-＋305640×75-83050069893＋-15054440×247－85014＋9875345-46×7503÷587829×6897×-54359948＋2573045-69×0÷3568＋965-375486＋75÷943658＋4573-56859＋75-4356＋985-743548×95-70430684＋759-0345485975×-3450768＋945-750450425.0,38×0,0÷121 025-.1074-.835.5.×57489＋5-458×9475-03405.24×05,3÷8,00102.-150.74-83.5×.555.8÷2.7050×2545×.2（6＋7413）（42488＋46）÷323279＋646÷23×25727＋966÷00325×586-45×81÷728-55×408÷25.63÷48.6＋.326386÷6＋432664×0427－58446×418－58604×427－8504×59874×89328×379478×1910.81/5+/738/5-40－812×24（642＋8）×6042×50－117÷5532＋1055÷（10＋87）×425420×327（－238）41(21+238)÷79716×5197-13 4496×12+4912450×(3123-189)3500056×2-1325(97-×18)6429+84÷03034×3-15420+82÷0-20254×41-×25100（3÷2-30×）070×〔（424-2÷）8〕17×65+7553×54115
发布于 2025-01-15 14:51:42
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