x+y=1 则x^2/(x+2)+y^2/(y+1)最小值为?
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
已知x+y=a,2x-y=-2a,求[(x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
2y(x+二分之一y)-[(x+y)(x-y)+2y(y+x)],其中|x-1|=2
(x-y)(x+y)-(x+y)^2+2y(y-x),其中x=1,y=3.
若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x=
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
设f(x+y,x-y)=x^2-y^2,则f(x,y)=
若f(x+y,y/x)=x^2-y^2,则F(X,Y)=
已知f(x+y,y/x)=x^2-y^2,则f(x,y)=
x+2y=2x+y+1=7x-y 求:2x-y?
x(x-2y)=y(2y-x) ,则y分之x是多少
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
设x,y满足约束条件x+y>=1,x-y>=-1,2x-y
设x,y满足约束条件x+y>=1,x-y>=-1,2x-y
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51