[a c]-[a] [b]化简怎么算

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[a c]-[a] [b]化简怎么算

[a c]-[a] [b]化简怎么算
[a c]-[a] [b]化简怎么算

[a c]-[a] [b]化简怎么算
[a c]-[a] [b]
=ac-ab
=a(c-b)