Question

9．把$\frac{2}{3}$×$\frac{1}{5}$=$\frac{2}{15}$改寫成兩道除法算式是$\frac{2}{15}$÷$\frac{2}{3}$=$\frac{1}{5}$和$\frac{2}{15}÷\frac{1}{5}=\frac{2}{3}$．

Answer 1

分析 因數(shù)、因數(shù)和積的關(guān)系：因數(shù)×因數(shù)=積，積÷一個因數(shù)=另一個因數(shù)，據(jù)此解答即可．

解答 解：把$\frac{2}{3}$×$\frac{1}{5}$=$\frac{2}{15}$改寫成兩道除法算式是：$\frac{2}{15}$÷$\frac{2}{3}$=$\frac{1}{5}$和 $\frac{2}{15}÷\frac{1}{5}=\frac{2}{3}$．
故答案為：$\frac{2}{15}$÷$\frac{2}{3}$=$\frac{1}{5}$、$\frac{2}{15}÷\frac{1}{5}=\frac{2}{3}$．

點評 此題主要考查了因數(shù)、因數(shù)和積的關(guān)系：因數(shù)×因數(shù)=積，積÷一個因數(shù)=另一個因數(shù)，要熟練的掌握．