4(2x-y)^-9(x+3y)^
(x+3y-4)(2x-y)
9y=3x-(x-1),4(x+y)-(2x+4)=8y
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
4x^2+2x-9y^2-3y
计算(4x^2y-9y)/(2x+3)
计算题:(2x+3y)^2-(4x-9y)(4x+9y)+(2x-3y)^2
因式分解:4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^3
(2x-y)(2x+y)-2(3x-4y)(4y+3x)
已知4x=9y求(1)x+y/y (2)y-x/2x
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
(x-3y)(y+2x)-(4y-3x)(3x+4y)计算