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)
|x+y+2|+(2x+3y+5)²=0 求x y的值.
(2X-3y)-(5x-y)
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
已知x,y为实数,且2(x+2y)=x²+y²+5求代数式3x-4y分之x²+y²
X,Y的值是X+3Y=5,X≡2,Y等于多少?
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)
2(2x+3y)(3x+2y)-(6x-y)(2x-5y)
[(x+2y)^2 -(x+y)(3x-y)-5y^2]÷2x
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x