|
∵
=x2+2 x2-2
+ x2-2
且4 x2-2
>0,x2-2
>04 x2-2
∴
+ x2-2
≥24 x2-2
=4(当且仅当
×x2-2 4 x2-2
=x2-2
即x=4 x2-2 + .
时取“=”)6
即
的最小值为4x2+2 x2-2
故答案为4
|
∵
=x2+2 x2-2
+ x2-2
且4 x2-2
>0,x2-2
>04 x2-2
∴
+ x2-2
≥24 x2-2
=4(当且仅当
×x2-2 4 x2-2
=x2-2
即x=4 x2-2 + .
时取“=”)6
即
的最小值为4x2+2 x2-2
故答案为4