y=4(x-1)^2-4 y=-2x^2+x-4开口方向对称轴顶点坐标(1)y=-2x^2+x-4(2)y=4(x-1)^2-4
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{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
(x-4y)(2x+y)=
先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
已知:【(x²+y²)-(x-y)²+2y(x-y)】/4y=1,求4x/4x²-y²-1/2x+y
已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙
已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
[(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2
[(y-2x)(-2x-y)+4(x-2y)平方]/3y,其中x=1,y=-3
[(x+y)(x-y)-(x-y)^2-4xy]/2y,其中x=1,y=-1
4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=?
[(2x+y)^2+(y+2x)(y-2x)-2y(4x-y)]/4y,其中x=1/2,y=1/3
先化简,再求值:[(x+y)(x-y)-(x-y)^2+2y(x-3y)]/(-4y),其中x=1,y=-2
先化简,再求值:[(x+y)(x-y)-(x-y)²+2y(x+y)]除4y,其中x=2,y=1
[(2x-y)^2-y(y-4x)-8x]其中x=-1/2