就两道题①3y²-4=2y ②2x²=4x-1
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
[(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
求值(x-2y)²-4(x-2y)+2(x-2y)²-3(x-2y),其中x=-1,y=2分之1
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
(1)下列是反比例函数的是:①y=2x②y=-2x+2③y=4/x④y=-2/x²⑤y=a/x⑥y=π/x
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知3X²-2y=4,-X²-3y=3,问:①4X²+y=( ) ②2X²-5y