一、口算。
$ 85 + 205 = $
$ 81 ÷ \frac{9}{7} = $
$ 2 - \frac{13}{12} = $
$ \frac{4}{7} - \frac{2}{21} = $
$ \frac{7}{8} × \frac{12}{7} = $
$ \frac{7}{10} + \frac{1}{8} = $
$ 0.26 × 5 = $
$ \frac{7}{5} ÷ \frac{14}{15} = $
$ 1.5 × 1.5 = $
$ \frac{5}{7} + \frac{3}{14} = $
$ 72 × \frac{7}{12} = $
$ \frac{8}{9} - \frac{3}{4} = $
$ \frac{10}{11} × \frac{11}{25} = $
$ 240\% - 1 = $
$ 144 ÷ \frac{9}{8} = $
$ \frac{1}{2} ÷ \frac{5}{8} = $
$ 1.92 × 5 = $
$ 15.6 ÷ 0.13 = $
$ 0.3 + 7.7 = $
$ 9.5 - 0.08 = $
$ \frac{5}{18} × \frac{3}{25} = $
$ 85 + 205 = $
290
$ 81 ÷ \frac{9}{7} = $
63
$ 2 - \frac{13}{12} = $
$\dfrac{11}{12}$
$ \frac{4}{7} - \frac{2}{21} = $
$\dfrac{10}{21}$
$ \frac{7}{8} × \frac{12}{7} = $
$\dfrac{3}{2}$
$ \frac{7}{10} + \frac{1}{8} = $
$\dfrac{33}{40}$
$ 0.26 × 5 = $
1.3
$ \frac{7}{5} ÷ \frac{14}{15} = $
$\dfrac{3}{2}$
$ 1.5 × 1.5 = $
2.25
$ \frac{5}{7} + \frac{3}{14} = $
$\dfrac{13}{14}$
$ 72 × \frac{7}{12} = $
42
$ \frac{8}{9} - \frac{3}{4} = $
$\dfrac{5}{36}$
$ \frac{10}{11} × \frac{11}{25} = $
$\dfrac{2}{5}$
$ 240\% - 1 = $
1.4
$ 144 ÷ \frac{9}{8} = $
128
$ \frac{1}{2} ÷ \frac{5}{8} = $
$\dfrac{4}{5}$
$ 1.92 × 5 = $
9.6
$ 15.6 ÷ 0.13 = $
120
$ 0.3 + 7.7 = $
8
$ 9.5 - 0.08 = $
9.42
$ \frac{5}{18} × \frac{3}{25} = $
$\dfrac{1}{30}$
答案
290 63 $\dfrac{11}{12}$
$\dfrac{10}{21}$ $\dfrac{3}{2}$ $\dfrac{33}{40}$
1.3 $\dfrac{3}{2}$ 2.25
$\dfrac{13}{14}$ 42 $\dfrac{5}{36}$
$\dfrac{2}{5}$ 1.4 128
$\dfrac{4}{5}$ 9.6 120
8 9.42 $\dfrac{1}{30}$
$\dfrac{10}{21}$ $\dfrac{3}{2}$ $\dfrac{33}{40}$
1.3 $\dfrac{3}{2}$ 2.25
$\dfrac{13}{14}$ 42 $\dfrac{5}{36}$
$\dfrac{2}{5}$ 1.4 128
$\dfrac{4}{5}$ 9.6 120
8 9.42 $\dfrac{1}{30}$
二、计算下面各题,怎样简便就怎样计算。
$ ( \frac{5}{6} + \frac{1}{5} - \frac{2}{3} ) × 30 $
$ \frac{3}{7} × ( 1 ÷ \frac{3}{4} - \frac{3}{4} ) $
$ 1.6 × 6.6 + 4.8 × 7.8 $
$ 250 + 156 ÷ 6 × 5 $
$ 6 ÷ \frac{3}{4} - \frac{3}{4} ÷ 6 $
$ 25\% × 24 × 12.5\% × 4 $
$ ( \frac{5}{6} + \frac{1}{5} - \frac{2}{3} ) × 30 $
$ \frac{3}{7} × ( 1 ÷ \frac{3}{4} - \frac{3}{4} ) $
$ 1.6 × 6.6 + 4.8 × 7.8 $
$ 250 + 156 ÷ 6 × 5 $
$ 6 ÷ \frac{3}{4} - \frac{3}{4} ÷ 6 $
$ 25\% × 24 × 12.5\% × 4 $
答案
11 $\dfrac{1}{4}$ 48
380 $7\dfrac{7}{8}$ 3
380 $7\dfrac{7}{8}$ 3
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