www.fltk.net > 7.8*0.37+0.78*6.3怎么巧算

7.8*0.37+0.78*6.3怎么巧算

7.8×0.37+0.78×6.3 =7.8×0.37+7.8×0.63 =7.8×(0.37+0.63) =7.8×1 =7.8

7.8×0.37 +0.78×6.3巧算 =7.8×(0.37+0.63) =7.8×1 =7.8

7.8×(2.5+7.4+0.1)

0.78×0.7÷0.39 =0.78÷0.39×0.7 =2×0.7 =1.4

3.6×0.78+7.2×0.11 =3.6×0.78+3.6×2×0.11 =3.6×(0.78+0.22) =3.6×1 =3.6

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