已知正整数x,y满足2x+49=y2,则x=______,y=______.
已知正整数x,y满足2x+49=y2,则x=______,y=______.
已知实数x,y满足2x-y-5=0,则x2+y2的最小值为______.
已知实数x,y满足x2+y2=2x,则x2y2的取值范围是______.
已知实数x,y满足x+y=1,则x2+y2的最小值是______.
已知实数x,y满足2x+y≥1,则u=x2+y2+4x-2y的最小值为______.
已知实数x、y满足x2+4xy+4y2+x+2y-6=0,则x+2y的值为______.
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
已知x2-4y2=20,x+2y=5,则x=______,y=______.
已知x2+4x+y2-2y+5=0,则x2+y2=______.
已知x-y=5,(x+y)2=49,则x2+y2的值等于______.
已知实数x、y满足(x2+y2)(x2+y2-1)=2,则x2+y2的值为______.
已知x-y=2,则x2-y2-4y=______.