$ 4 \frac{4}{5}+\left\{2 \frac{1}{5}-\frac{1}{2}\left(1 \frac{1}{4}-\frac{1}{4}-\frac{1}{5}\right)\right\} $
已知:$ 4 \frac{4}{5}+\left\{2 \frac{1}{5}-\frac{1}{2}\left(1 \frac{1}{4}-\frac{1}{4}-\frac{1}{5}\right)\right\} $
要求:求解
解答:
$ 4 \frac{4}{5}+\left\{2 \frac{1}{5}-\frac{1}{2}\left(1 \frac{1}{4}-\frac{1}{4}-\frac{1}{5}\right)\right\} $
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{1}{2}\left( \frac{5}{4}-\frac{1}{4}-\frac{1}{5}\right)\right\} $
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{1}{2}\left( \frac{5}{4}-\frac{5-4}{20}\right)\right\} $ [4 和 5 的最小公倍数是 20]
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{1}{2}\left( \frac{5}{4}-\frac{1}{20}\right)\right\} $
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{1}{2}\left( \frac{5\times5-1}{20}\right)\right\} $ [20 和 4 的最小公倍数是 20]
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{1}{2}\left( \frac{25-1}{20}\right)\right\} $
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{1}{2}\left( \frac{24}{20}\right)\right\} $
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{1}{2}\left( \frac{6}{5}\right)\right\} $ [24 和 20 都可以被 2 整除]
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{1}{2}\times \frac{6}{5}\right\} $
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{6}{10}\right\} $
$ \frac{24}{5}+\left\{\frac{11}{5}-\frac{3}{5}\right\} $ [6 和 10 都可以被 2 整除]
$ \frac{24}{5}+\left\{\frac{11-3}{5}\right\} $
$ \frac{24}{5}+\left\{\frac{8}{5}\right\} $
$\frac{24}{5}+\frac{8}{5}$
$\frac{24+8}{8}$
$\frac{32}{8}$
4