2n+(7n-3m)-4(n-2m),化简代数式,

问题描述:

2n+(7n-3m)-4(n-2m),化简代数式,

2n+(7n-3m)-4(n-2m)
=2n+7n-3m-4n+8m.展开
=(8-3)m+(2+7-4)n.合并同类项
=5m+5n