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( )/2.4=3.6/1.2 7.5/( )=2.5/12 2.7/( )=3/9 1.6/...

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

良配,小磨合。

130*35 =130*70/2 =9100/2 =4550 或: 130*35 =(100+30)*35 =3500+1050 =4550

过江千尺浪,入竹万竿斜.

=(0.7×4)÷(0.25×4) =2.8÷1 =2.82.5×3.2×12.5 =(2.5×0.4)×(8×12.5) =1×100 =10012.5×9.6×0.25=(12.5×0.8)×3×(4×0.25...

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