9x^2-9y^2-6x+1

(x+y)^2+6(x+y)+9 约分下列分式(x-y)/(y-x)³(x²-9)/(6-2x)(x²-1)/(x-x²) 1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/（x^2-5x+6）+（x^2-3x+8）/（x^2-4x+3）2.{(x^2)/（x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{（x^2/x^2+y^2）^2} 9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解 计算：1.（x-1)^2+2(1-x) 2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y）1.（x-1)^2+2(1-x)2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y） x^3y^2+6x^2y+9x (x-2y)^2-6(2y-x)(x+y)+9(x+y)^2因式分解 9(x+y)^2-6(x+y)+1因式分解 9(x+y)^2-6(x+y)+1进行因式分解 9(X+Y)^2-6(X+Y)+1 (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) 解二元一次方程 {3(x+y)-4(x-y)=-9 x+y/2+x-y/6=1 因式分解 （1）.(x+y)(x+y-6)+9 （2）.x²-16y²-x-4y 化简：(1)(x+1)^2-x(x^2+x-1)-(x^2+1)^0(2)(y-2)(y^2-6y-9)-y(y^2-2y-15) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)