计算下列各式:(1)5x^-1y^4/4x^2y(2)(x^2-9/x^2-6x+9)^-3
2个回答
(1)5x^-1y^4/4x^2y
=(5/4)·x^(-3)·y³
.
(2) (x^2-9)/(x^2-6x+9)^-3
=(x+3)(x-3)/(x-3)^6
=(x+3)/[(x-3)^5]
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