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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

答案是:119,1486,184,18,691,24

(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 ...

80/72

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

=27/18×2/3×1/2 =1×1/2 =1/2

1;4.2×7.8+2.2×4.2, =(7.8+2.2)×4.2, =10×4.2, =42; 2;9.5×101, =9.5×(100+1), =9.5×100+9.5×1, =950+9.5, =959.5; 3;(8×3.82)×1.25, =8×3.82×1.25, =(8×1.25)×3.82, =10×3.82, =38.2; 4;0.125×72, =0.125×8×9, =1×...

①12.5×0.4×2.5×8=(12.5×8)×(0.4×2.5)=100×1=100②9.5×101=9.5×(100+1)=9.5×100+9.5=959.5③43.2-1.8×3-4.6=43.2-5.4-4.6=43.2-(5.4+4.6)=33.2④4.2×7.8+2.2×4.2=4.2×(7.8+2.2)=4.2×10=42⑤0.87×3.16+4.64=2.7492+4.64=7.3892⑥12.5×4.8=12....

(1+99)×99/2

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