若x^2y^2
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若x^2y^2若x^2y^2若x^2y^2题目应是x^2y^3x^2y^3则有y化简-2xy|-1/2x^5y^7|=-2xy|1/2(x^2y^3)^2*(xy)|=-2xy*(1/2(x^2y^3
若x^2y^2
若x^2y^2
若x^2y^2
题目应是 x^2y^3<0,化简-2xy|-1/2x^5y^7|
x^2y^3<0
则有y<0
化简-2xy|-1/2x^5y^7|
=-2xy|1/2(x^2y^3)^2*(xy)|
=-2xy*(1/2(x^2y^3)^2)*|xy|
=-x^5y^7*|xy|
(1)当x>0时
上式=-x^5y^7*(-xy)
=x^6y^8
(2)当x<0时
上式=-x^5y^7*(xy)
=-x^6y^8
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