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7.2x0.15怎么算

7.2x0.15的简便方法 7.2x0.15 =0.15*(7+0.2) =0.15*7+0.15*0.2 =1.08

0.7x2/15+3/15x0.2 =2/15*(0.7+0.3) =2/15

15.7*0.2-5.7*0.2 =0.2*(15.7-5.7) =0.2*10 =2

原式 =7.38x0.5x20-2.15 =7.38x(0.5x20)-2.15 =7.38x10-2.15 =73.8-2.15 =70.65

7.38x0.5x20-2.15这道题怎么简算 =0.5x20x7.38-2.15 =10x7.38-2.15 =73.8-2.15 =71.65

7.2x1.6+0.8 =(7.2x2+1)x0.8 =15.4x(1-0.2) =15.4-3.08 =12.32

2.2x+7.8x=15.36 10x=15.36 x=15.36/10 x=1.536 验算 左边=2.2x1.536+7.8x1.536 =(2.2+7.8)x1.536 =10x1.536 =15.36 =右边 谢谢,请采纳

0.15×2.1+1.5×7.9 =1.5x0.21+1.5x7.9 =1.5x(0.21+7.9) =1.5x8.11 =1.5x8+1.5x0.1+1.5x0.01 =12+0.15+0.015 =12.165.

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