y=-6x*2+9x-6
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y=-6x*2+9x-6
y=-6x*2+9x-6
y=-6x*2+9x-6
y=-6x^2+9x-6
=-6(x-3/4)^2-21/8
顶点坐标为:(3/4,-21/8)
3X-6
无穷解
y=-3X-6
= =这是要化简???
y=-3x-6
(x+y)^2+6(x+y)+9
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
x+2y=6 2x+y=9
2x+6y-x²+9y²=?
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知6x+2y/9x-3y=6,那么(3x+y)平方/x平方-y平方
x^3y^2+6x^2y+9x
已知方程组{2x+y=6 x+2y=9},求x+y与x-y的值
已知x+y=9,x-y=6,求x²-y²-2x-2y的值
解二元一次方程 {3(x+y)-4(x-y)=-9 x+y/2+x-y/6=1
合并同类项 9(X+Y)-2(X+Y)-6(X+Y)=x+Y
把(x+y)看做是一个整体合并同类项:9(x+y)-2(x+y)-6(x+y)=多少?
(x-2y)^2-6(2y-x)(x+y)+9(x+y)^2因式分解
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2
9(x+y)-2(x+y)-6(x+y)+18(x+y)合并同类项
合并同类项:9(x+y)-2(x+y)-6(x+y)+18(x+y)
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2