x=-2.5,y=-32,

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x=-2.5,y=-32,
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x=-2.5,y=-32,
x=-2.5,y=-32,
 

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

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知x-y=8,（x+y)(x-y)=32,求x,y的值 化简 x / y(x+y) - y / x(x+y) = z=0.015x*x+y*x*0.05+(1-x-y)*2.5*(x+y) x>0.35.xy>0.70x+y x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? y=x(x x=-2.5,y=-32, x+x+x+x+y+y+y=56 x+y=22 2.5x+7y=100 X+Y=32 3X=5Y x+y=32,2x+4y=100 X:2.5=Y:3/4 求X:Y 急 x+x+x+y+y=6.4 y+y+y+x+x=7.1 怎么算? 二元函数f(x,y)=x+y/x-y,求f(y/x,x/y) x-y/x+y=(x-y)²/x²-y²（x≠y) （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y