若x、y满足x+3y+|3x-y|=19,2x+y=6,则x=______,y=______.
若3x-4y=0,则x/y=______,(x-y)/y=______,(3x+2y)/(2x+3y)=_____.
若2x+3y-1=y-x-8=x+6,则2x-y=______.
若x+3y=3x+2y=7,则x=______,y=______.
若2x-3y=5,则6-4x+6y=______.
若|3x-y-7|+(5x+2y-8)2=0,则x-y=______.
已知2x+3y=5,则6x-4y-2(x-5y)=______.
已知正实数x、y满足x+2y=xy,则2x+y的最小值等于______.
已知正实数x,y满足xy+2x+y=4,则x+y的最小值为______.
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若实数x,y满足xy+x+y+7=0,3x+3y=9+2xy,则x2y+xy2=______.
若实数x、y满足x2+y2-2x+4y=0,则x-3y的最大值是______.
已知正整数x,y满足2x+49=y2,则x=______,y=______.