68. Let x be a real number. Given 2 22 f ( ) 2( 2 1) 4 8 3 x xx xx = +−− −− , −≤ ≤ 2 1 x . Let the maximum of ( ) f x is M and the minimum is m. Evaluate M + m =
(A) 0
(B) 3
(C) −3
(D) 6 11

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統計： A(0), B(2), C(1), D(2), E(0) #2320025

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#4922076


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