14.求 1×31+4×28+7×25+…+28×4+31×1=?
(A)1570
(B)1826
(C)2082
(D)2816
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統計: A(26), B(279), C(120), D(36), E(0) #1338714
統計: A(26), B(279), C(120), D(36), E(0) #1338714
