y=-6x*2+9x-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