题目内容

5.想怎样算就怎样算.
14÷$2\frac{3}{4}$$6\frac{1}{2}$÷$5\frac{1}{5}$$3\frac{1}{3}$÷$1\frac{8}{15}$÷$\frac{2}{23}$
($\frac{1}{2}$+$\frac{2}{3}$)÷$\frac{1}{12}$4÷$\frac{4}{5}$-$\frac{4}{5}$÷4           $\frac{1}{3}$÷$\frac{5}{16}$×$\frac{9}{22}$

分析 (1)(2)(3)把带分数化为假分数,除法改为乘法计算;
(4)先算加法,再算除法;
(5)先算除法,再算减法;
(6)把除法改为乘法计算.

解答 解:(1)14÷$2\frac{3}{4}$
=14×$\frac{4}{11}$
=$\frac{56}{11}$;

(2)$6\frac{1}{2}$÷$5\frac{1}{5}$
=$\frac{13}{2}$×$\frac{5}{11}$
=$\frac{65}{22}$;

(3)$3\frac{1}{3}$÷$1\frac{8}{15}$÷$\frac{2}{23}$
=$\frac{10}{3}$×$\frac{15}{23}$×$\frac{23}{2}$
=25;

(4)($\frac{1}{2}$+$\frac{2}{3}$)÷$\frac{1}{12}$
=$\frac{7}{6}$×12
=14;

(5)4÷$\frac{4}{5}$-$\frac{4}{5}$÷4
=4×$\frac{5}{4}$-$\frac{4}{5}$×$\frac{1}{4}$
=5-$\frac{1}{5}$
=4$\frac{4}{5}$;

(6)$\frac{1}{3}$÷$\frac{5}{16}$×$\frac{9}{22}$
=$\frac{1}{3}$×$\frac{16}{5}$×$\frac{9}{22}$
=$\frac{24}{55}$.

点评 掌握运算顺序与计算方法是正确计算的前提.

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