xy^2*(-x^2y^2)(1/2xy^3)^2=-xy^2*x^2y^2*1/4x^2y^6
=-1/4x^5y^10
(xy^2)^5=x^5y^10
当xy^2=2时,原式=-1/4*2^5
=-1/4*32
=-8
xy²=2,求代数式xy²乘(-x²y²)乘(1/2xy³)²
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