
(x-y)的7次方÷(y-x)的4次方+(-x-y)的8次方÷(x+y)的5次方
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(x-y)的7次方÷(y-x)的4次方+(-x-y)的8次方÷(x+y)的5次方
=(x-y)^3+(x+y)^3
=(x-y+x+y)[(x-y)^2-(x-y)(x+y)+(x+y)^2]
=2x(x^2+3y^2)
=3x^3+6xy^2
=(x-y)^3+(x+y)^3
=(x-y+x+y)[(x-y)^2-(x-y)(x+y)+(x+y)^2]
=2x(x^2+3y^2)
=3x^3+6xy^2
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