①(1-Y)²-(1+Y)² ②(3X-Y)²-(2X+Y)²+5Y²
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
【(X²+Y²)-(X-Y)²+2Y(X-Y)】/4Y=1,求4X/4X²-Y&
(3x-y)²-2x(4x-5y)-(x+2y)²
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
因式分解 -5x³y(x-y)³+20y【x²(y-x)】²
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)