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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

答案是:119,1486,184,18,691,24

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

(4/5-8/15×1/2)÷3/5 =(4/5-4/15)÷3/5 =8/15÷3/5 =8/9

5.5x2.3+1.7x5.5 =5.5x(2.3+1.7) =5.5x4 =22 朋友,请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!!! 朋友,请【采纳答案】,您的采纳是我答题的动力,如果没有明白,请追问。谢谢。

(1)22.3-2.45-5.3-4.55,=(22.3-5.3)-(2.45+4.55),=17-7,=10;(2) 9 20 ÷[ 1 2 ×( 2 5 + 1 3 )] ,= 9 20 ÷[ 1 2 × 11 15 ],= 9 20 ÷ 11 30 ,= 27 22 ;(3)[43.3×(2-75%)+7]× 1 2 ,=[43.3×1.25+7]× 1 2 ,=[54.125+7]× 1 2 ,...

(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÷...

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)0.08×720×1.25=0.08×1.25×720=0.1×720=72;(2)5.25×8.2+5.25×0.8+5.25=5.25×(8.2+0.8+1)=5.25×10=52.5;(3)0.125×808=0.125×(8×101)=(0.125×8)×101=1×101=101;(4)18.45-(3.8×2.7+5.3)=18.45-(10.26+5.3)=18.45-15.56=2.89...

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