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7.2x0.15怎么算

7.2×0.15 =7.2×0.5×0.3 =3.6×0.3 =1.08

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

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

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.

314x0.043 + 3.14x7.2 - 31.4x0.15 = 314x0.043 + 3.14 x 7.2 - 3.14 x 1.5 = 314 x 0.043 + 3.14x(7.2 - 1.5) = 314 x 0.043 + 3.14 x 5.7 = 3.14 x 4.3 + 3.14 x 5.7 = 3.14 x 10 = 31.4

=(2x3x2)x(3x7)x(5x3x3)x(2x5.1) 除以 (3x5)x(2x2)x0.7x51 =54

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