已知:a=19911991…1991(1991个1991)问:a除以13所的余数是几?2e;p9Y,C,f-Z2p9r4f+S:j5T+Z
算式:提示-C1b8[3n't;t1J5y7M9I0d2H8E,^2e;p9Y,C,f-Z2p9r4f+S:j5T+Z
答:a除以13的余数是1S,\:w/W7N。2e;p9Y,C,f-Z2p9r4f+S:j5T+Z