x-y=48,x+y=6,则y∧x=____
若x*x+y*y-4x+16y+13=0 ,则x=____ y=____
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若x,y互为相反数(y≠0),则2x+5+2y+3x/y=____
已知x ^2+9y ^2-2x+12y+5=0,则x=____,y=____.
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
1.若2x-y=0,且x-5>y,则x、y的取值范围是x=____,y=____.
若实数x,y满足(x-2y-2)(3x+2y+2)+2(x2+4)=0,则x=____,y=____
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
二元函数f(x,y)=x+y/x-y,求f(y/x,x/y)
1.已知1/x+1/y=-1/x+y,则y/x+x/y=?
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20