a(x-y)-b(x-y)的公因式是

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a(x-y)-b(x-y)的公因式是

a(x-y)-b(x-y)的公因式是
a(x-y)-b(x-y)的公因式是

a(x-y)-b(x-y)的公因式是
公因式是(x-y)
结果是(x-y)(a-b)

公因式是x-y

公因式是x-y