已知xx+yy-4x-6y+13=0求3x+4y的值
已知xx+yy+4x-6y+13=0,求(xx-2x)/xx+3yy的值.
已知xx+yy-4x-6y+13=0求3x+4y的值
已知2x=3y,求xy/xx+yy-yy/xx-yy的值
已知XX+YY+4X-6Y+13=0,则X的Y次方是
若(xx)+(yy)-4x+6y+13=0,求2x+3y的值?
已知 xx-2x+yy+6y+10=0 求x+y的值
已知x(x+1)-(xx+y)=3,求(xx+yy)/2-xy的值
已知(x+y)(x+y)=25,(x-y)(x-y)=9求xy与xx+yy的值
已知x-y=5,y-z=4,求xx+yy+zz-xy-yz-xz的值
x(x+1)-(xx+y)=-3,求(xx+yy)/2-xy的值
已知14(XX+YY+ZZ)=(X+2Y+3Z)^2,求X:Y:Z
已知X+4Y+3X=3X-2Y-5Z=0(XYZ不等于0),求XY+YZ+2XZ/2XX-3YY+7ZZ的值