(x-2y)的2N次方/(2y-x)的2n-1次方+(2x-y)(-2x-y)+(x-y)(-x+y)
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(x-2y)的2N次方/(2y-x)的2n-1次方+(2x-y)(-2x-y)+(x-y)(-x+y)(x-2y)的2N次方/(2y-x)的2n-1次方+(2x-y)(-2x-y)+(x-y)(-x+
(x-2y)的2N次方/(2y-x)的2n-1次方+(2x-y)(-2x-y)+(x-y)(-x+y)
(x-2y)的2N次方/(2y-x)的2n-1次方+(2x-y)(-2x-y)+(x-y)(-x+y)
(x-2y)的2N次方/(2y-x)的2n-1次方+(2x-y)(-2x-y)+(x-y)(-x+y)
(x-2y)的2N次方/(2y-x)的2n-1次方=2y-x
(2x-y)(-2x-y)=y^2-4x^2
(x-y)(-x+y)=-x^2+2xy-y^2
(x-2y)的2N次方/(2y-x)的2n-1次方+(2x-y)(-2x-y)+(x-y)(-x+y)
=2xy+2y-x-5x^2
2y²-5x²+2xy+2y-x
2y-x-5x²+2xy