循序渐进,去完成吧.
(a-b)^2,
(a-1)^2
(X-1/2)^2
(Y+1/3)^2
(2X+1)^2
(2X-3Y)^2
(1/2X+2Y)^2
(a-3/2)^2
(2a-3)^2
(-X-Y)^2
(-X+2Y)^2
(X-Y)^2+(X+Y)^2
(X+Y)^2-(X-Y)^2
(2X-1/2Y^2)^2
2(X^2-3Y)^2
3(1/2X+1/3)^2
(X-2Y)^2+(2X+Y)^2
4(X-3Y)^2+24(X+Y)^2
(X+1)^2+(X-1)^2+(X-3)^2+(X+2)^2
(XY-1)^2