巧算 25×57+25×42+25

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巧算25×57+25×42+25巧算25×57+25×42+25巧算25×57+25×42+2525×57+25×42+25=25×57+25×42+25×1=25×(57+42+1)=25×100=

巧算 25×57+25×42+25
巧算 25×57+25×42+25

巧算 25×57+25×42+25
25×57+25×42+25
=25×57+25×42+25×1
=25×(57+42+1)
=25×100
=2500
【结合律】