14.求 1×31+4×28+7×25+…+28×4+31×1=?
(A)1570
(B)1826
(C)2082
(D)2816
答案:登入後查看
統計: A(26), B(282), C(122), D(37), E(0) #1338714
統計: A(26), B(282), C(122), D(37), E(0) #1338714
