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,
答
原式=2n+7n-3m-4n+8m
=(2+7-4)n+(8-3)m
=5n+5m
答
2n+（7n-3m)-4（n-2m)
=2n+7n-3m-4n+8m
=5n+5m
答
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
答
2n+（7n-3m)-4（n-2m)
=2n+7n-3m-4n+8m
=5m+5n