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5.7%1.9x0.2➗7.6怎么简便运算

12.6x7.6x2.32➗1.9➗1.4➗2.9如何用简便计算? 12.6x7.6x2.32➗1.9➗1.4➗2.9 =(12.6÷4)*(7.6÷1.9)*(2.32÷2.9) =3.15*4*0.8 =10.08

2.1*5.1 *159.1➗0.7➗1.7➗3.7 =(2.1➗0.7)*(5.1 ➗1.7)*(159.1➗3.7) =3x3x43 =387

结合律。 列式为: 2100➗42 =2100➗(7x6) =2100➗7➗6 =300➗6 =50

0.8x0.25x0.4x12.5 4.58➗2.5➗0.4 都简便计算过程具体 0.8x0.25x0.4x12.5 =(0.8*12.5)*(0.25*0.4) =10*0.1 =1 4.58➗2.5➗0.4 =4.58÷(2.5*0.4) =4.58÷1 =4.58

250+616➗28x15 =250+616➗7➗4x15 =250+88➗4x15 =250+22x15 =250+22x5x3 =250+110x3 =250+330 =580

42➗28 =42➗7➗4 =6➗4 =1.5

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