4a(x-y)-2b(y-x)
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4a(x-y)-2b(y-x)4a(x-y)-2b(y-x)4a(x-y)-2b(y-x)4a(x-y)-2b(y-x)=4a(x-y)+2b(x-y)=(x-y)(4a+2b)希望对你有帮助
4a(x-y)-2b(y-x)
4a(x-y)-2b(y-x)
4a(x-y)-2b(y-x)
4a(x-y)-2b(y-x)
=4a(x-y)+2b(x-y)
=(x-y)(4a+2b)
希望对你有帮助
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