(x-2y)2n÷(2y-x)2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
问题描述:
(x-2y)2n÷(2y-x)2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
答
原式=(2y-x)2n÷(2y-x)2n-1+(y2-4x2)-(x2-2xy+y2)=2y-x+y2-4x2-x2+2xy-y2=2y-x-5x2-2xy.