一、口算。
$ \frac{4}{5} - \frac{3}{5} = $
$ \frac{1}{6} + \frac{2}{6} = $
$ \frac{5}{9} - \frac{2}{9} = $
$ 4900 ÷ 7 = $
$ 1.67 - 0.92 = $
$ 38 + 299 = $
$ 2.6 × 4 = $
$ 1 - 0.77 = $
$ 1.3 × 0.3 = $
$ 4 ÷ 5 = $
$ \frac{4}{5} - \frac{3}{5} = $
$\dfrac{1}{5}$
$ \frac{3}{16} + \frac{2}{16} = $$\dfrac{5}{16}$
$ \frac{8}{19} - \frac{3}{19} = $$\dfrac{5}{19}$
$ \frac{1}{6} + \frac{2}{6} = $
$\dfrac{3}{6}$
$ \frac{7}{30} - \frac{2}{30} = $$\dfrac{5}{30}$
$ \frac{5}{8} + \frac{1}{8} = $$\dfrac{6}{8}$
$ \frac{5}{9} - \frac{2}{9} = $
$\dfrac{3}{9}$
$ \frac{11}{16} + \frac{8}{16} = $$\dfrac{19}{16}$
$ \frac{9}{17} - \frac{3}{17} = $$\dfrac{6}{17}$
$ 4900 ÷ 7 = $
700
$ 1.71 + 0.39 = $2.1
$ 0.14 × 0.2 = $0.028
$ 1.67 - 0.92 = $
0.75
$ 0.62 × 5 = $3.1
$ 908 ÷ 2 = $454
$ 38 + 299 = $
337
$ 4.1 - 0.01 = $4.09
$ 1.05 + 0.99 = $2.04
$ 2.6 × 4 = $
10.4
$ 8 ÷ 0.04 = $200
$ 1.09 × 5 = $5.45
$ 1 - 0.77 = $
0.23
$ 0.33 × 8 = $2.64
$ 4.7 - 3.66 = $1.04
$ 1.3 × 0.3 = $
0.39
$ 5.2 ÷ 0.4 = $13
$ 1.02 × 20 = $20.4
$ 4 ÷ 5 = $
0.8
$ 8.8 + 0.12 = $8.92
$ 2.92 - 0.65 = $2.27
答案
一、$\dfrac{1}{5}$ $\dfrac{5}{16}$ $\dfrac{5}{19}$
$\dfrac{3}{6}$ $\dfrac{5}{30}$ $\dfrac{6}{8}$
$\dfrac{3}{9}$ $\dfrac{19}{16}$ $\dfrac{6}{17}$
700 2.1 0.028
0.75 3.1 454
337 4.09 2.04
10.4 200 5.45
0.23 2.64 1.04
0.39 13 20.4
0.8 8.92 2.27
$\dfrac{3}{6}$ $\dfrac{5}{30}$ $\dfrac{6}{8}$
$\dfrac{3}{9}$ $\dfrac{19}{16}$ $\dfrac{6}{17}$
700 2.1 0.028
0.75 3.1 454
337 4.09 2.04
10.4 200 5.45
0.23 2.64 1.04
0.39 13 20.4
0.8 8.92 2.27
二、把下面相等的两个数连起来。

答案
$\frac{15}{8}$——$1\frac{7}{8}$
$4\frac{3}{5}$——$\frac{23}{5}$
$\frac{25}{9}$——$2\frac{7}{9}$
$2\frac{6}{7}$——$\frac{20}{7}$
$\frac{24}{12}$——$2$
$5\frac{1}{8}$——$\frac{41}{8}$
$4\frac{3}{5}$——$\frac{23}{5}$
$\frac{25}{9}$——$2\frac{7}{9}$
$2\frac{6}{7}$——$\frac{20}{7}$
$\frac{24}{12}$——$2$
$5\frac{1}{8}$——$\frac{41}{8}$
解析
$\frac{15}{8}$——$1\frac{7}{8}$
$4\frac{3}{5}$——$\frac{23}{5}$
$\frac{25}{9}$——$2\frac{7}{9}$
$2\frac{6}{7}$——$\frac{20}{7}$
$\frac{24}{12}$——$2$
$5\frac{1}{8}$——$\frac{41}{8}$
$4\frac{3}{5}$——$\frac{23}{5}$
$\frac{25}{9}$——$2\frac{7}{9}$
$2\frac{6}{7}$——$\frac{20}{7}$
$\frac{24}{12}$——$2$
$5\frac{1}{8}$——$\frac{41}{8}$
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