1.y=3/2xˇ-2-2x.2.y=-2xˇ-3x+5 3.y=3xˇ+4x 的1.开口方向2.顶点坐标3.对称轴

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x^2-y分之y(x-y)-x(x+y)除以x+y分之x^2+y^2.其中x=2,y=-1.先化简再求值. {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (x+y)(2x-3y)=? 结果用幂的形式表示:1.（x-y）^2(y-x)= 2.(x-y)^2(y-)^2= 3.(x-y)^2(y-x)^3= 4.(x-y)^3(y-x)= 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 先化简再求值:(x+y)(x-y)+(x^2-2xy+y^2)-(x^2y)^3÷(x^2y)^2,其中x=1,y=2. 1.(x-2y)(x+2y)-(x平方+y)(x平方-y) 2.(2x-y)(y+2x)-(2y+x)(2y-x)3.已知：x+y=6,x平方-y平方=48,求x,y的值4.x平方-2x分之x+2 -- x平方-4x+4分之x-1 {(x+2)^2-(y-3)^2=(x+y)(x-y) {x-3y=2 x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 (3x-y)^2+(3x+y)(3x-y),x=1,y=-2 (-x+2y)(2x+y)-(2x+y)(y-2x)-3xy=?因式分解