若x,y满足|x-y+1|+(x+y+3)2=0,则x2-y2=______.
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
若实数x、y满足x2+y2-2x+4y=0,则x-3y的最大值是______.
若实数x,y满足x2+y2-2x+4y=0,则x-2y的最大值为______.
若实数x、y满足约束条件|x|+|y|≤1,则z=x2+y2-2x-2y的最大值为______.
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)(x2+y2-1)=2,则x2+y2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______.
若实数x,y满足2x2+3y2=1,S=3x2-2y2,则S的取值范围是______.
已知实数x、y满足x2+4xy+4y2+x+2y-6=0,则x+2y的值为______.
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x2+y2+2x=0则x+y得最小值
若实数x,y满足X2+y2-2X+4y=0,则x-2y的最大值为?