31.二次函數y=x2+4x+3 有最小值為何?
(A)1
(B)-1
(C)3
(D)-3
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統計: A(4), B(23), C(4), D(11), E(0) #2715398
統計: A(4), B(23), C(4), D(11), E(0) #2715398