三、算一算。
1.直接写出得数。
$\frac{5}{6} - \frac{1}{6} =$ $\frac{2}{3} - \frac{1}{4} =$ $0.5 - \frac{1}{3} =$ $\frac{7}{9} + \frac{2}{3} + \frac{2}{9} + \frac{1}{3} =$
$\frac{3}{7} + \frac{11}{7} =$ $0.2^3 =$ $7 - \frac{5}{7} =$ $0.25 + \frac{5}{6} - 0.25 + \frac{5}{6} =$

$\frac{5}{6} - \frac{1}{6} = \frac{2}{3}$
$\frac{2}{3} - \frac{1}{4} = \frac{5}{12}$
$0.5 - \frac{1}{3} = \frac{1}{6}$
$\frac{7}{9} + \frac{2}{3} + \frac{2}{9} + \frac{1}{3} = 2$
$\frac{3}{7} + \frac{11}{7} = 2$
$0.2^3 = 0.008$
$7 - \frac{5}{7} = 6\frac{2}{7}$
$0.25 + \frac{5}{6} - 0.25 + \frac{5}{6} = \frac{5}{3}$

2. 计算下面各题。
$2 - \dfrac{5}{13} + \dfrac{9}{13}$
$\dfrac{3}{5} + \dfrac{7}{10} + \dfrac{2}{5} - \dfrac{3}{10}$
$\dfrac{4}{3} - ( \dfrac{5}{12} - \dfrac{1}{4} )$

$2 - \dfrac{5}{13} + \dfrac{9}{13}$
$= \dfrac{26}{13} - \dfrac{5}{13} + \dfrac{9}{13}$
$= \dfrac{21}{13} + \dfrac{9}{13}$
$= \dfrac{30}{13}$
$\dfrac{3}{5} + \dfrac{7}{10} + \dfrac{2}{5} - \dfrac{3}{10}$
$= (\dfrac{3}{5} + \dfrac{2}{5}) + (\dfrac{7}{10} - \dfrac{3}{10})$
$= 1 + \dfrac{4}{10}$
$= 1\dfrac{2}{5}$
$\dfrac{4}{3} - ( \dfrac{5}{12} - \dfrac{1}{4} )$
$= \dfrac{4}{3} - ( \dfrac{5}{12} - \dfrac{3}{12} )$
$= \dfrac{4}{3} - \dfrac{1}{6}$
$= \dfrac{8}{6} - \dfrac{1}{6}$
$= \dfrac{7}{6}$

3.解方程。
$x - \frac{1}{2} = \frac{7}{18}$
$2x - \frac{3}{11} = \frac{8}{11}$
$\frac{1}{3} + \frac{5}{6} - x = \frac{1}{6}$

解：
$x - \frac{1}{2} = \frac{7}{18}$
$x = \frac{7}{18} + \frac{1}{2}$
$x = \frac{7}{18} + \frac{9}{18}$
$x = \frac{16}{18}$
$x = \frac{8}{9}$
$2x - \frac{3}{11} = \frac{8}{11}$
$2x = \frac{8}{11} + \frac{3}{11}$
$2x = 1$
$x = 1 ÷ 2$
$x = \frac{1}{2}$
$\frac{1}{3} + \frac{5}{6} - x = \frac{1}{6}$
$\frac{2}{6} + \frac{5}{6} - x = \frac{1}{6}$
$\frac{7}{6} - x = \frac{1}{6}$
$x = \frac{7}{6} - \frac{1}{6}$
$x = 1$

1. 五育＞智育 人工智能越来越多地应用于现实生活。某地要将135台“智能导游”分配到4个景区，如果每个景区都分配奇数台“智能导游”，你能完成这个分配任务吗？说说你的理由。

1. 不能完成这个分配任务,因为4个奇数相加,和是偶数,而135是奇数