x=-2.5,y=-32,

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x=-2.5,y=-32,

7x√(y/x)+2/y*√(xy³)-3y√(x/y)+ √(16xy)
=7√(x²y/x)+2*√(xy³/y²)-3√(xy²/y)+ 4√(xy)
=7√(xy)+2√(xy)-3√(xy)+ 4√(xy)
=10√(xy)
=10√[-2.5*(-32)]
=10√80
=40√5

Y：2.5=X 那么X和Y（）正比例二元函数f(x,y)=x+y/x-y,求f(y/x,x/y) [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 ) y=cos(x-y) x+y=5; x^y+y^x=17 因式分解下列式子：x(x-y)+y(y-x)=? 根据x+x+x+y+y=54,x+x+y+y+y=56,求出x.y的值已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 求y'=y/(y-x) (x+y-z)(x-y+z)= (x-y)(x+y)(xx-yy)=?