8m²-(6m²+15m²n)÷3m+m(n-1) 计算
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8m²-(6m²+15m²n)÷3m+m(n-1)计算8m²-(6m²+15m²n)÷3m+m(n-1)计算8m²-(6m
8m²-(6m²+15m²n)÷3m+m(n-1) 计算
8m²-(6m²+15m²n)÷3m+m(n-1) 计算
8m²-(6m²+15m²n)÷3m+m(n-1) 计算
原式
=8m² -2m -5mn +mn -m
=8m² -4mn -3m