(x+y)^2 +6(x+y)+9 和a^2-2a(b+c)+(b+c)^2公因式

（2a+b)（2a-3b）+3a（2a+b)和x（x+y)(x-y)-x(x+y)²4a（x+y)-6x-6y和啊a（a-b）-ab+b² (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) 初二计算题和因式分解计算：1．(X^3)^2+(-X)^5-(-X)^8/(-X)^3先化简,再求值2．(X+Y)(X-Y)+(X-Y)^2-(6X^2Y-2XY^2)/2y,其中,X=-2.Y=三份之一因式分解3．9x^2(a-b)+y^2(b-a) 确定常数a,使方程组5x+3y=4a和6x-2y=9a和4x-5y=8a-3有解方程组是：5x+3y=4a和6x-2y=9a和4x-5y=8a-3,试卷上是大括号,然后三个方程式子 分式x/2x+6y,3/x-3y,x+y/x²-9y² 的最简公分母是( ) .A.(x+3y)(x-3y) B.2(x+3y)(x-3y) C.3(x+3y)(x-3y) D.2(x-3y)² 通分 a/(y-x)^2,b/(x-y)(x+y) 因式分解a(x-y)+b(y-x)+(2x-y) a^2(x-y)+(y-x)因式分解 (x-2y)^2-6(2y-x)(x+y)+9(x+y)^2因式分解 (x+y)^2 +6(x+y)+9 和a^2-2a(b+c)+(b+c)^2公因式 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) 初二数学通分问题2x+6y/x—3y和x/x—9y²和1/x²6xy+9y² 分式计算：x^2-4/x^2+6x+9÷x+2/x+3 a/(a-2)-4a/a^2-4 1/(x-y)-1/(x+y)*x^2-2xy+y^2/(y+1)^2-(y-1)^2x^2-4/x^2+6x+9÷x+2/x+3a/(a-2)-4a/a^2-41/(x-y)-1/(x+y)*x^2-2xy+y^2/(y+1)^2-(y-1)^2 1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y)