Question

14．脱式计算：
$\frac{4}{5}$×$\frac{5}{12}$×$\frac{1}{8}$
$\frac{9}{10}$÷$\frac{3}{5}$÷$\frac{1}{4}$
$\frac{3}{5}$÷$\frac{11}{15}$÷$\frac{5}{32}$
$\frac{3}{4}$×4÷$\frac{3}{4}$．

Answer 1

分析 按照分数四则运算顺序从左往右进行计算即可．

解答 解：（1）$\frac{4}{5}$×$\frac{5}{12}$×$\frac{1}{8}$
=$\frac{1}{3}$×$\frac{1}{8}$
=$\frac{1}{24}$

（2）$\frac{9}{10}$÷$\frac{3}{5}$÷$\frac{1}{4}$
=$\frac{9}{10}$×$\frac{5}{3}$×4
=$\frac{3}{2}$×4
=6

（3）$\frac{3}{5}$÷$\frac{11}{15}$÷$\frac{5}{32}$
=$\frac{3}{5}$×$\frac{15}{11}$×$\frac{32}{5}$
=$\frac{9}{11}$×$\frac{32}{5}$
=$\frac{288}{55}$

（4）$\frac{3}{4}$×4÷$\frac{3}{4}$
=3×$\frac{4}{3}$
=4

点评 考查学生对分数四则运算法则和运算顺序的掌握情况．