题目内容

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÷$\frac{3}{4}$.

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.

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