Question

7．计算下列各题．

48×$\begin{array}{l}\frac{5}{12}\end{array}$×$\begin{array}{l}\frac{7}{8}\end{array}$	15÷$\begin{array}{l}\frac{5}{4}\end{array}$÷$\begin{array}{l}\frac{8}{7}\end{array}$	$\frac{16}{25}$×$\begin{array}{l}\frac{15}{32}\end{array}$÷$\begin{array}{l}\frac{9}{10}\end{array}$
$\begin{array}{l}\frac{6}{35}\end{array}$÷$\begin{array}{l}\frac{15}{14}\end{array}$×$\begin{array}{l}\frac{5}{21}\end{array}$	$\begin{array}{l}\frac{39}{56}\end{array}$×$\begin{array}{l}\frac{8}{13}\end{array}$÷$\begin{array}{l}\frac{6}{35}\end{array}$	$\begin{array}{l}\frac{15}{32}\end{array}$÷$\begin{array}{l}\frac{3}{4}\end{array}$×$\begin{array}{l}\frac{16}{25}\end{array}$

Answer 1

分析 都只含有乘除法，按照从左向右的顺序进行计算．

解答 解：（1）48×$\begin{array}{l}\frac{5}{12}\end{array}$×$\begin{array}{l}\frac{7}{8}\end{array}$
=20×$\frac{7}{8}$
=$\frac{35}{2}$；

（2）15÷$\begin{array}{l}\frac{5}{4}\end{array}$÷$\begin{array}{l}\frac{8}{7}\end{array}$
=12÷$\frac{8}{7}$
=12×$\frac{7}{8}$
=$\frac{21}{2}$；

（3）$\frac{16}{25}$×$\begin{array}{l}\frac{15}{32}\end{array}$÷$\begin{array}{l}\frac{9}{10}\end{array}$
=$\frac{3}{10}$×$\frac{10}{9}$
=$\frac{1}{3}$；

（4）$\begin{array}{l}\frac{6}{35}\end{array}$÷$\begin{array}{l}\frac{15}{14}\end{array}$×$\begin{array}{l}\frac{5}{21}\end{array}$
=$\frac{4}{25}$×$\frac{5}{21}$
=$\frac{4}{105}$；

（5）$\begin{array}{l}\frac{39}{56}\end{array}$×$\begin{array}{l}\frac{8}{13}\end{array}$÷$\begin{array}{l}\frac{6}{35}\end{array}$
=$\frac{3}{7}$×$\frac{35}{6}$
=$\frac{5}{2}$；

（6）$\begin{array}{l}\frac{15}{32}\end{array}$÷$\begin{array}{l}\frac{3}{4}\end{array}$×$\begin{array}{l}\frac{16}{25}\end{array}$
=$\frac{5}{8}$×$\frac{16}{25}$
=$\frac{2}{5}$．

点评 只含有一级运算的，按照从左向右的顺序进行计算．