? , ? ? C ( 槡 2 2 , 槡 2 2 ) , ? C \ c ? ? ( x - 槡 2 2 ) 2 + ( y - 槡 2 2 ) 2 = 1 . ú Q ( x , y ) , ¤ P ( 2 x , 2 y ) , ] R P ? ? C ? U ( 2 x - 槡 2 2 ) 2 + ( 2 y - 槡 2 2 ) 2 = 1 , H ( x - 槡 2 4 ) 2 + ( y - 槡 2 4 ) 2 = 1 4 , A R Q 0 1 \ b ? ? Z c ? ? ( x - 槡 2 4 ) 2 + ( y - 槡 2 4 ) 2 = 1 4 . ( 2 4 ) ( Ⅰ) f ( x ) = x + 1 + x - 1 = - 2 x , x < - 1 2 , - 1 ≤ x ≤ 1 2 x , x { > 1 . P x < - 1 S , ] - 2 x < 4 , U - 2 < x < - 1 ; P - 1 ≤ x ≤ 1 S , 2 < 4 ò ó , A - 1 ≤ x ≤ 1 ; P x > 1 S , ] 2 x < 4 , U 1 < x < 2 . T ? , M = ( - 2 , 2 ) . ( Ⅱ) ] a , b ∈ M d , a , b ∈( - 2 , 2 ) . > ? 4 a + b 2 - 4 + a b 2 = 4 ( a 2 + 2 a b + b 2 ) - ( 1 6 + 8 a b + a 2 b 2 ) = 4 a 2 + 4 b 2 - 1 6 - a 2 b 2 = 4 ( a 2 - 4 ) + b 2 ( 4 - a 2 ) = ( a 2 - 4 ) ( 4 - b 2 ) < 0 , A 4 a + b 2 < 4 + a b 2 , N ′ 2 a + b < 4 + a b .
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