人教版五年级数学(精品)五年级上册数学重点易错题集（含答案）1、1.25×2018表示（）。2、去掉0.88的小数点，就是把这个数扩大（）；把50.4的小数点向左移动两位，就是把它缩小到原来的（）。3、两个因数相乘，一个因数扩大10倍，另一个因数扩大3倍，积会（）。4.一个不为0的数乘以0.8，它的积比这个数（）。一个自然数乘以0.01，就是把这个自然数（）。5、把“2.58×0.03”中的0.03扩大为3而使积不变，另一个因数2.58的小数点应()，积保留两位小数是（）。6、56÷11的商用循环小数表示是（）精确到百分位是（）。7、3÷11的商用循环小数的简便写法记作（）商保留一位小数是（）。8、9.97÷4.21的商保留两位小数是()保留整数是（）。9、在“”中，最小的是（），最大的是（）。10、两个因数的积是3.4，如果把两个因数同时扩大10倍，积是（）11、三个2.5连乘得积是（）。12、3x=6.9的解是（）。()13x2.5x=51435dm2=cm27.4m2=dm27.5m2=cm2350m2=500=370=315=1.8=2.15=7.6=1516171820cm2()1910cm20362144.55223cm4cm5cm,2310.024n251250.1251000.326ba2716cmacmbcmcmcm2()281654298300.250.151.6;0.790.04,19,315cm9cm6cm3215cm10cm6cmcm23351413425cmdm353cm7cmcm236()02120.837.0748.40.58.4567801910100.10.10.10.1=0.911x22x12a22a1314151617()181920421102252x=16.25.6236x6=6x12422031a2.5Aa2.5B2.5aC1.5a2Aa+a2aBa2a2Ca+aa233.7512.5A375012.5B37.5125C375012544.7994.7ABC()53.54.2A8.7B14.7C1.26A3200.24B2.40.32C240.320413.2x0.8__________________2380.5x__________________353.65.6x__________________470.384.6__________________051551.2()22.20.21800345242.435()50.250.154.5618542472.5111.250.81.25201920.2510050.4()3103304.00.80.0110052.580.030.0332.580.08656115.0909095.0973110.389.974.212.37293.23103.410340112.515.625123x=6.92.313x2.53.5xx=57.51435dm2=3500cm27.4m2=740dm2()7.5m2=75000cm22350m2=0.235500=0.05370=3.7315=3.251.8=1482.15=1297.6=7601516171820350cm21910cm20cm203627()2144.550.45,100,99,44.5599=0.45223cm4cm5cm6cm2,2.4cm3cm4cm=342=6cm2,=625=2.4cm2310.010.049.9524nn-1n+1251250.1250.0031000.326baab2716cmacmbcm2a+16cm8bcm228165412()=16-52=6cm=642=12cm229864300.250.151.610;0.790.04,19,3315cm9cm6cm0.423215cm10cm6cm60cm23351419514-5+1=10(5+14)102=953425cm1.25dm()353cm7cm59.5cm236021334?43?,1,.:2.5662.52.56.2,..,2.50.6()2.5,2.50.982.5.?20.800.837.077.077.0748.40.58.45678011()2-0.5)=-4910100.10.10.10.1=0.911x22xx=2x22x12a22aa2a2a22a131415123216()1700181920421102252x=16.25.6236x6=6x1()24222cm3cm4cm1024cm6cm8cm4024031a2.5CAa2.5B2.5aC1.5a2.5a-a=1.5a2AAa+a2aBaa2Ca+aa2a+a2aa33.7512.5BA375012.5B37.5125C3750125104C4.7994.7ABC53.54.2BA8.7B14.7C1.2()3.53.5,4.24.23.54.214.76BA3200.24B2.40.32C240.320413.2x0.8x3.2=0.82380.5x3x+x2=80.5353.65.6x5x-3.6x=5.640.384.64.6(7+0.38)051551.2()+=x1.2x1.2x+x=552.2x=55x=552.2x=25=1.2x=1.22.5=30()22.20.2180018002.2(2.2-0.2)18002.2(2.2-0.2)18002.2(2.2-0.2)-1800=1803452()2(+)2=x2x(2x+x)2=453x=453x=22.5x=22.5x=7.5=2x=27.5=15157.5=112.542.435x2.4x2.4x-35=x+352.4x-x=35+351.4x=70x=701.4x=50()2.4x=2.450=120()1205050.250.154.54.50.150.25=300.25=7.5618542472.5247-(18+54)2.5=247-722.5=247-180=67
