x/(x-1)=(y²+4x-2)/(y²+4x-1),则y²+4y+x值为
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
已知x²-4x+4与|y-1/2|互为相反数,则式子(x/y-y/x)÷(x+y)的值为
(x-2y)²+(2x-4y)(x+y)+(x+y)²
【(X²+Y²)-(X-Y)²+2Y(X-Y)】/4Y=1,求4X/4X²-Y&
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
1.已知x/x-1=(y²+4y-1)/(y²+4y-2),则y²+4y-x的值为多少?
(3x-y)²-2x(4x-5y)-(x+2y)²
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y