(1)(x+y)^2-6x(x+y)+9x^2(2)a^2+2a(b+c)+(b+c)^2以上是分解因式的题目

(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) 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） 约分下列分式(x-y)/(y-x)³(x²-9)/(6-2x)(x²-1)/(x-x²) (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) 2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 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) 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} 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)