X+15=2Y,则18-2Y+X=
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x^2+y^2=15,x+y=7,x>y,求x-y
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
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(x-2y)=y(2y-x) ,则y分之x是多少
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
{2x+y=15 x+2y=18
已知F(X+Y,X-Y)=X^2*Y+X*Y^2,则F(X,Y)=?
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
若2x=3y,则(x*x+y*y)/x*x=?
2x+y=15 x+2y=18 x=?y=?
若2x-y=2y-x=15,则x-y=________.
因为x=y,所以2x=2y,所以2s-(x+y)=2y-(x+y),即x-y=y-x则(x-y)/(y-x)/(x-y)对不对
若2x-y=2y-x+15,则x-y=( )
x y属于R 2^x=18^y=6^xy则x+y
填空:x-y/x+y=( )/x^2-y^2