3x²(x-y)+6x(y-x)
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
(x-y)³(y-x)(y-x)²+(x-y)^6
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
(3x-y)²-2x(4x-5y)-(x+2y)²
计算:(3x-4y)-[-(2y+x)+(x-3y)]-6x
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
计算:(x+2y)(3x-5y)-(6x的四次方y²-2x²y²)÷(2x²y&
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²