4+12(x-y)+9(a-y)^2
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解,
因式分解:4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^3
因式分解.1.ax^2+(a^2+1)x+a 2.3x^2+5xy-2y^2+x+9y-4 3.4(x-y+1)+y(y
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
4-12(x-y)+9(x+y)^2
分解因式:9(x-y)*2+12(x*2-y*2)+4(x+y)*2
3a(x-y)+9(y-x
已知4x=9y求(1)x+y/y (2)y-x/2x
计算:(a-b)(x-y)-(b-a)(x+y) 4+12(x-y)+9(x-y)²
-3a^2(x-2y)^3+12a(2y-x)^4分解因式
计算:"3y/x+y"+"y/y-x"+"2x/x^2-y^2" "a+2/a^2-4a+4"-"1/2a+4"-"a-