(2X+3Y)(-2X-5Y)怎么做
(2x+3y)(x-4y)、(5x-y)(-x-3y)、(3-x)(4+y)谁告诉我这类题怎么做呀?
(2x-3y)2-(4y-3x)(3x+4y)怎么做?
[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?
-5(5x+y)-3(2x-3y)怎么做?
(x^2-xy)y÷y-x/xy怎么做?
x^4-2x^2y-3y^2+6y-4因式分解怎么做
y=3x平方+2x怎么做啊
(2x-3y)-(5x-y)怎么算
(x+y)*(a+2b)怎么做
有谁知道数学通分X-Y/2X+2Y与XY/(X+Y)怎么做?
数学(x-y)^5*(y-x)^3*(x-y)^2
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)