用一個兩位數(shù)去除2051,余數(shù)是63,商是________.
28
分析:根據(jù)題意,可設(shè)除數(shù)是A,商是B,那么根據(jù)被除數(shù)=商×除數(shù)+余數(shù),可得到AB+63=2051,然后再將AB的積分解質(zhì)因數(shù),最后確定出除數(shù)的大小,進而求出商.
解答:設(shè)除數(shù)是A,商是B,
AB+63=2051,
AB=1988,
1988=2×2×7×71,
因為余數(shù)小于除數(shù),
所以這個兩位數(shù)的除數(shù)為:71;
所以商是:1988÷71=28.
答:用一個兩位數(shù)去除2051,余數(shù)是63,商是28;
故答案為:28.
點評:此題主要考查的知識點如下:1、在有余數(shù)的除數(shù)算式中,余數(shù)小于除數(shù);
2、被除數(shù)=商×除數(shù)+余數(shù);
3、分解質(zhì)因數(shù).