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五年级简便运算

75×102 =75*(100+2) =75*100+75*2 =7500+150 =7650 1.2×2.5 =(1+0.2)*2.5 =1*2.5+0.2*2.5 =2.5+0.5 =3 90.1-9.9 =(90+0.1)-(10-0.1) =90+0.1-10+0.1 =80+0.2 =80.2 90.1×9.9 =(90+0.1)*(10-0.1) =900-9+1-0.01 =908-0.01 =907.99 3....

1)3643-74+6357-76 (2)39×24+39×46+39×30 (3)108×35 (4)345×98 (5)25×64×125×5 (6)8500÷25 (7)94×73+27×94 (8)125×79 (9)1.2×99 (10)9÷0.25 (11)4.7×5.9+5.2×4.7-4.7×0.1 (12)3.6×2.4+36×0.76 (13)(3.25×7+3.25)×0.125 ...

(1)2.5*32*0.125 =(2.5*4)*(8*0.125) =10*1 =10 (2)3.5-7+6.5 =3.5+6.5-7 =3 (3)1.2×2.5+0.8×2.5 =2.5(1.2+0.8) =25 (4)8.9×1.25-0.9×1.25 =1.25(8.9-0.9) =10 (5)12.5×7.4×0.8 =12.5×0.8×7.4 =74 (6)6.5×9.5+6.5×0.5 =6.5×(9....

题目在哪里

用简便方法计算下列各题 0.25×0.28 0.125×3.2×2.5 35×40.2  0.25×4÷0.25×4 3.5×9.9 3.5×99+3.5  3.5×101-3.5 3.5×9.9+3.5×0.1 3.5×2.7+35×0.73 3.5×2.7-3.5×0.7 (32+5.6)÷0.8 3.5÷0.6-0.5÷0.6 4.9÷3.5 7÷0.25÷4 7÷0.125 ÷8  7.35...

常见以下几类题型: 一、运用加法结合律进行简算 (a+b)+c=a+(b+c) 或a+b+c+d=(a+c)+(b+d) 例1、5.76+13.67+4.24+6.33 =(5.76+4.24)+(13.67+6.33) =10+10 =20 例2、37.24+23.79-17.24 =37.24-17.24+23.79 =20+23.79 =43.79 二...

运算定律与简便运算 编辑 加法运算分为:加法交换律和加法结合律 乘法运算分为:乘法交换律、乘法结合律和乘法分配律 除法性质:商不变 减法性质: 差不变 小数性质 中文名 运算定律与简便运算 减法性质 商不变 除法性质 商不变 小数性质 商不变 ...

解析: 48×(1/2+1/6+1/3+1/12) =48×(1/2)+48×(1/6)+48×(1/3)+48×(1/12) =24+8+16+4 =52

2.9×0.45+0.29×4.2+0.029×13 =2.9×0.45+2.9×0.1×4.2+2.9×0.01×13 =2.9×0.45+2.9×0.42+2.9×0.13 =2.9×(0.45+0.42+0.13) =2.9×1=2.9 3.84×9.6+0.96×61.6 =9.6×3.84+9.6×0.1×61.6 =9.6×3.84+9.6×6.16 =9.6×(3.84+6.16) =9.6×10=96

32.6×1.01-0.1×3.26 =32.6×1.01-0.01×32.6 =32.6×(1.01-0.01) =32.6×1 =32.6

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