2n+(7n-3m)-4(n-2m),化简代数式,

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2n+(7n-3m)-4(n-2m),化简代数式,2n+(7n-3m)-4(n-2m),化简代数式,2n+(7n-3m)-4(n-2m),化简代数式,2n+(7n-3m)-4(n-2m)=2n+7n-

2n+(7n-3m)-4(n-2m),化简代数式,
2n+(7n-3m)-4(n-2m),化简代数式,

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

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

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

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