来自刘小虎的问题
(x-2y)2n÷(2y-x)2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
(x-2y)2n÷(2y-x)2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
1回答
2019-11-22 12:38
(x-2y)2n÷(2y-x)2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
(x-2y)2n÷(2y-x)2n-1+(2x-y)(-2x-y)+(x-y)(-x+y)
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.