8(x^-2y^)-x(7x+y)+xy?
问题描述:
8(x^-2y^)-x(7x+y)+xy?
答
等于8×-16y-7X一Xy十Xy
等于 X一16y
8(x^-2y^)-x(7x+y)+xy?
等于8×-16y-7X一Xy十Xy
等于 X一16y