25×57+25×42+25 简便发法怎么算

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25×57+25×42+25简便发法怎么算25×57+25×42+25简便发法怎么算25×57+25×42+25简便发法怎么算25×57+25×42+25=25×(57+42+1)=25×100=25

25×57+25×42+25 简便发法怎么算
25×57+25×42+25 简便发法怎么算

25×57+25×42+25 简便发法怎么算
25×57+25×42+25
= 25×(57 + 42 + 1)
= 25×100
= 2500

25X(57+42+1)=25X100=2500

写成25*(57+42+1)=25*100=2500;