若实数x,y满足|xy|=1,则x2+4y2的最小值为______.
若实数x,y满足|xy|=1,则x2+4y2的最小值为______.
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
实数x、y满足x2+y2=4,则x+y-xy的最大值为______.
实数xy满足x2+y2+2x-4y+1=0,则x2+y2-2x+1的最小值为
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2x-y-5=0,则x2+y2的最小值为______.
若实数XY满足X2+Y2=1,则X-2Y的最大值为
已知实数x,y满足x+y=1,则x2+y2的最小值是______.
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
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,z满足x+2y+3z=a(a为常数),则x2+y2+z2的最小值为______.
设x,y为实数,代数式5x2+4y2-8xy+2x+4的最小值为______.