(2x²/3y²)*(5y/6x)/(10y、21x²)
(3x-y)²-2x(4x-5y)-(x+2y)²
(2x²/3y²)*(5y/6x)/(10y、21x²)
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-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
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
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)³(y-x)(y-x)²+(x-y)^6
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?