因式分解
(1-x^2)(1-y^2)-4xy
x^2-x+y^2+y-2xy-6
因式分解
(1-x^2)(1-y^2)-4xy
x^2-x+y^2+y-2xy-6
1楼解答的对,我来补充第二个
(1—X^2)(1-Y^2)-4XY
1-X^2-Y^2+X^2Y^2-4XY
(1-XY)^2-(X+Y)^2
(1-XY+X+Y)(1-XY-X-Y)
1题:4X^4+1=(2x²)²+4x²+1-4x²
=(2x²+1)²-(2x)²
=(2x²+2x+1)(2x²-2x+1)
x²-x+y²-2xy-6=(x²-2xy+y²)—(x-y)—6
= (x-y)²-(x-y)-6
=(x-y-3)(x-y+2)