已知x,y满足x-y+5>=0,x+y>=0,x
已知x,y满足约束条件x-y+5>=0 x+y>=0 X
已知x,y满足约束条件:x-y+1>=0,x+y-2>=0,x
已知x,y满足-5|x-2y|+8|y-1\2|=0则x=( ),y=( )
已知有理数X和Y,满足|X-Y|+|Y-5|=0,求3X-9Y的值
已知实数x,y满足不等式组:2x-y=0,x+2y
已知实数x、y满足x²+y²+4x-6y+13=0
已知实数x,y满足关系式5x+12y-60=0,则x
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0
已知关于x、y 的方程组x-y=a+3与2X+Y=5的解x、y满足x>0,y
变量x,y满足x-2y=0,x