(x^2)/(y^2)如何化简?
二次方程化简问题.已知 X^2 +X - Y^2 - Y= 0 如何化简为 (X+Y)(X-Y-1)= 0 是十字相乘么
如何化简(x+y+z)(x+y-z)(x-y+z)(-x+y+z)
分式x^2-y^2/(x-y)^2如何约分
x^2+y^2-x-y-xy+1如何因式分解
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
2x(x-y)4-x2(x-y)2+xy(y-x)2 如何因式分解
3(x-y)-2(x+y)-5(x-y)+4(x+y)+3(x-y) 化简合并同类项
化简求值:x/[9(x-y)^2]*[(x^2-y^2)/(x+y)]+{[(x^2+2)/(x+y)]-2}
谁帮我化简:[(x+y)(x-y)-(x+y)^2-2y(x-y)-2xy]÷xy
化简求值 [(x-y^2)+(x+y)(x-y)]÷2x.
化简求值:[(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y,其中x=二分之一,y=2
化简求值:[2x的平方-(x+y)(x-y)][(-x-y)(y-x)+2y的平方],其中x=1,y=2