(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
(x+y)²-2(x²-y²)+(y-x)²
(x+y)²-4(x+y-1)
(3x-2y)²(3x-2y)²(9x²+4y²)²
1.已知x/x-1=(y²+4y-1)/(y²+4y-2),则y²+4y-x的值为多少?
「(x²+y²)-(x-y)²+2y(x-y)」÷4y,其中2x-y=18
已知2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y 过程
2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y
1、x²+4y²+_______=(x-2y)²
再求代数式(4x²-7x+6y-1)-(-2x²+3y²+2y+2x)+(-6x²
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
化简再求值[(x²+y²)²-4x²y²]÷(x²-y&su