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A-1 B+1 C2+2 D2-2
A.-1 B.+1 C.2+2 D.2-2
若a,b,c>0且a(a+b+c)+bc=4-2,则2a+b+c的最小值为
(A)-1 (B) +1 (C) 2+2 (D) 2-2
A -1 B +1 C 2+2 D 2-2