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问题: x^(x+y)^-12x(x+y)^+36(x+y)^-(x+y)^4

解答:

x^2(x+y)^2-12x(x+y)^2+36(x+y)^2-(x+y)^4
=(x+y)^2(x^2-12x+36)-(x+y)^4
=(x+y)^2(x-6)^2-(x+y)^4
=(x+y)^2[(x-6)^2-(x+y)^2]
=(x+y)^2[(x-6)+(x+y)][(x-6)-(x+y)]
=(x+y)^2(2x+y-6)(-6-y)
=-(x+y)^2(2x+y-6)(6+y)