Question

4．甲數(shù)比乙數(shù)小53.1，把甲數(shù)的小數(shù)點(diǎn)向右移動(dòng)一位就和乙數(shù)相等，乙數(shù)原來是59．

Answer 1

分析 由“甲數(shù)的小數(shù)點(diǎn)向右移動(dòng)一位就和乙數(shù)相等”可知，乙數(shù)是甲數(shù)的10倍，乙數(shù)比甲數(shù)比9倍，多53.1，由此根據(jù)差倍公式解答即可．

解答 解：甲數(shù)：53.1÷（10-1）
=53.1÷9
=5.9
乙數(shù)：5.9×10=59
答：乙數(shù)是59．
故答案為：59．

點(diǎn)評(píng) 此題考查了差倍問題的基本解答方法，要注意牢記公式：差÷（倍數(shù)-1）=1倍數(shù)（較小數(shù)），1倍數(shù)（較小數(shù)）×倍數(shù)=幾倍數(shù)（較大數(shù)）．