Question

16．比25多它的$\frac{1}{5}$的數(shù)是30，比25少它的$\frac{1}{5}$的數(shù)是20．

Answer 1

分析 根據(jù)分?jǐn)?shù)乘法的意義，25的$\frac{1}{5}$是25×$\frac{1}{5}$，則比25多它的$\frac{1}{5}$的數(shù)是25+25×$\frac{1}{5}$，則比25少它的$\frac{1}{5}$的數(shù)是25-25×$\frac{1}{5}$，據(jù)此解答即可．

解答 解：（1）25+25×$\frac{1}{5}$
=25+5
=30
答：比25多它的$\frac{1}{5}$的數(shù)是30．

（2）25-25×$\frac{1}{5}$
=25-5
=20
答：比25少它的$\frac{1}{5}$的數(shù)是20．
故答案為：30，20．

點評 本題主要考查求一個數(shù)的幾分之幾是多少，用乘法計算．