求列表,(1)y=4x²-24x+26(2)y=2x²+8x-6(3)y=1/2x²-2x
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
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.
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)
已知|x+y+2|+(2x-3y-1)²=0 求 ⑴x、y的值 ⑵2x³-x²-3y
当x=2,y=-1时,求代数式(x+y)(x-y)+(x-y)²-(x²-3xy)的值