已知实数X,Y满足4／X4-2／X2=3,Y4+Y2=3,则(4／X4) +Y4的值为( )为什么

已知实数X,Y满足4／X4-2／X2=3,Y4+Y2=3,则(4／X4) +Y4的值为( ) 已知实数X,Y满足4／X4-2／X2=3,Y4+Y2=3,则(4／X4) +Y4的值为( )为什么 已知实数x,y满足x2+y2+2x-4y+5=0 已知实数x、y满足2x2-7xy+3y2=0,求x：y 已知实数x,y满足x2+y2+4x+3=0,求(y-2)/(x-1)的值域. 已知实数x,y满足x2+y2-2x+4y=0,则x2+y2的最小值是 已知实数x、y满足x2+4y2=2x+4y-2,求x-2y的平方根. 已知实数X,Y满足X2+3X+2Y-3=0,则X+Y的最大值是 已知实数x,y满足x2+y2=14x+6y+6那么3x+4y的最大值 已知实数x,y满足3x2+2y2=6x,则x2+y2的最大值是 已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值 x1-x2+x3=1x2-x3+x4=21若x1,x2,x3,x4,x5满足方程组 x3-x4+x5=3x4-x5+x1=4x5-x1+x2=5求x2 x3 x4的值2已知 x1+x4+x6+x7=39 x2+x4+x5+x7=49 x3+x5+x6+x7=41 x4+x7=13 x5+x7=14 x6+x7=9 x1+x2+x3+x4+x5+x6+x7=9求x7的值若x1,x2,x3,x4,x5满足方程组 x1-x 已知实数x,y满足x2+y2-4x+1=0,求2x+y的取值范围? 已知实数x,y满足x2+y2-4x=0,则y/x+2的取值范围是? 已知实数x,y满足x2+y2=4,求x+y的取值范围 已知实数x,y满足y=x2-2x+2(-1 已知实数xy满足x2-x+y=3则x+y的最大值是 初中数学题,请帮忙已知实数x,y满足方程(x2+2x+3)(3y2+2y+1)=4/3, 则x+y=