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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

(2/51+5/18)x9x17 =2/51x17x9+5/18x9x17 =2/3x9+5/2x17 =6+85/2 =6+42.5 =48.5

(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 ...

答案是:119,1486,184,18,691,24

2乘2.08等于多少 2*2.08=2*(2+0.08)=2*2+2*0.08=4+0.16=4.16

1/6+1/5+1/2 =5/30+6/30+15/30 =11/30+15/30 =13/15

(1)2.5×7.1×4,=(2.5×4)×7.1,=10×7.1,=71;(2)16.12×99+16.12,=16.12×(99+1),=16.12×100,=1612;(3)5.2×0.9+0.9×4.8,=0.9×(5.2+4.8),=0.9×10,=9;(4)[113-(34.15+38.25)]÷2,=[113-72.4]÷2,=40.6÷2,=20.3;(5)3.6÷...

7分之12—(7分之5+2分之1) =12/7-5/7-1/2 =7/7-1/2 =1-1/2 =1/2 [1—(4分之1+8分之3)]除以4分之1 =(1-1/4-3/8)x4 =1x4-1/4x4-3/8x4 =4-1-3/2 =3-3/2 =3/2 =1又1/2 8分之1 x 58+8分之1 x 42 =1/8x(58+42) =1/8x100 =100/8 =12又1/2 5分之4 x ...

(1)15?12×10%=15-120=320;(2)90.5×99+90.5=90.5×(99+1)=90.5×100=9050;(3)[14.8+(627?4.5)×1325]÷223.=[14.8+2514×1325]÷223=[14.8+2]÷223=16.8÷223=6.3.

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