Question

7．$\frac{4}{5}$的$\frac{3}{8}$是多少？算式是$\frac{4}{5}$×$\frac{3}{8}$．$\frac{4}{5}$×8表示8個(gè)$\frac{4}{5}$是多少．

Answer 1

分析 求一個(gè)數(shù)的幾分之幾是多少，用乘法計(jì)算，求$\frac{4}{5}$的$\frac{3}{8}$是多少，用$\frac{4}{5}$乘$\frac{3}{8}$即可；分?jǐn)?shù)乘整數(shù)的意義同整數(shù)乘法的意義相同，都是求幾個(gè)相同加數(shù)和的簡(jiǎn)便運(yùn)算，8個(gè)$\frac{4}{5}$是多少，據(jù)此解答．

解答 解：$\frac{4}{5}$的$\frac{3}{8}$是多少？算式是$\frac{4}{5}$×$\frac{3}{8}$．$\frac{4}{5}$×8表示8個(gè)$\frac{4}{5}$是多少．
故答案為：$\frac{4}{5}$×$\frac{3}{8}$，8個(gè)$\frac{4}{5}$是多少．

點(diǎn)評(píng) 本題主要學(xué)生對(duì)一個(gè)數(shù)乘分?jǐn)?shù)和分?jǐn)?shù)乘整數(shù)意義的掌握．