8(x^-2y^)-x(7x+y)+xy?

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8(x^-2y^)-x(7x+y)+xy?
8(x^-2y^)-x(7x+y)+xy?

8(x^-2y^)-x(7x+y)+xy?
等于8×-16y-7X一Xy十Xy
等于 X一16y