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脱式计算(能简算的,要简算) (2/5加1/3)乘以15 8/9乘2

(1)1.28+9.8+7.72+10.2,=(1.28+7.72)+(9.8+10.2),=9+20,=29;(2) 1 2 × 11 20 + 1 2 × 20 49 ,= 1 2 ×( 11 20 + 20 49 ),= 1 2 × 939 980 ,= 939 1960 ;(3) 7 8 ×[ 6 7 -( 1 21 + 3 7 )],= 7 8 ×[ 18 21 - 10 21 ],= 7 ...

4.7乘2.3加18.5脱式计算能简算要简算 4.7x2.3+18.5 =10.81+1.85 =12.66

答案是:119,1486,184,18,691,24

未完

(1)3.4÷[(1.2+0.5)×5],=3.4÷[1.2×5+0.5×5],=3.4÷[6+2.5],=3.4÷8.5,=0.4;(2)1.9+19.9+199.9+0.3,=1.9+19.9+199.9+(0.1+0.1+0.1),=(1.9+0.1)+(19.9+0.1)+(199.9+0.1),=2+20+200,=222.

原式=8/9÷(4/3-2/3) =8/9÷2/3 =8/9 ×3/2 =4/3

0.625×5.8+5/8×3.2+62.5% =0.625x5.8+0.625x3.2+0.625 =0.625x(5.8+3.2+1) =0.625x10 =62.5; 2017×2015/2016 =(2016+1)x2015/216 =2016x2015/2016+1x2015/2016 =2015+2015/2016 =2015又2015/2016; (1/2+1/3+1/6)x24 =1/2x24+1/3x24+1/6x24 =1...

(1/2+1/3)÷2/5-2/3 =5/6X5/2-2/3 =25/12-2/3 =17/12 无简单计算方法

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