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一、口算。
$3.9 - 1.03 =$
$628 ÷ 3.14 =$
$0.6 - 35\% =$
$65 × \frac{4}{39} =$
$\frac{3}{5} × \frac{1}{5} =$
$\frac{2}{5} - \frac{2}{7} =$
$\frac{4}{5} ÷ \frac{2}{5} =$
$3.9 - 1.03 =$
2.87
$\frac{2}{3} ÷ \frac{7}{9} =$$\frac{6}{7}$
$15.8 × 20 =$316
$628 ÷ 3.14 =$
200
$78\% + 36\% =$114%
$\frac{9}{10} - \frac{3}{5} =$$\frac{3}{10}$
$0.6 - 35\% =$
0.25
$0.125 × 8 =$1
$17.5 ÷ 10\% =$175
$65 × \frac{4}{39} =$
$\frac{20}{3}$
$\frac{3}{4} + \frac{3}{40} =$$\frac{33}{40}$
$24.6 ÷ 0.123 =$200
$\frac{3}{5} × \frac{1}{5} =$
$\frac{3}{25}$
$24 ÷ \frac{1}{6} =$144
$\frac{5}{7} × \frac{3}{5} =$$\frac{3}{7}$
$\frac{2}{5} - \frac{2}{7} =$
$\frac{4}{35}$
$4.5 ÷ 0.5 =$9
$\frac{2}{5} + \frac{8}{5} =$2
$\frac{4}{5} ÷ \frac{2}{5} =$
2
$\frac{3}{4} - \frac{2}{3} =$$\frac{1}{12}$
$2.48 ÷ 0.124 =$20
答案
一、2.87 $\frac{6}{7}$ 316
200 114% $\frac{3}{10}$
0.25 1 175
$\frac{20}{3}$ $\frac{33}{40}$ 200
$\frac{3}{25}$ 144 $\frac{3}{7}$
$\frac{4}{35}$ 9 2
2 $\frac{1}{12}$ 20
200 114% $\frac{3}{10}$
0.25 1 175
$\frac{20}{3}$ $\frac{33}{40}$ 200
$\frac{3}{25}$ 144 $\frac{3}{7}$
$\frac{4}{35}$ 9 2
2 $\frac{1}{12}$ 20
二、计算下面各题，怎样简便就怎样计算。
$\frac{5}{12} ÷ 8 + \frac{1}{8} × \frac{7}{12}$ $40 ÷ 3 - \frac{2}{3} × 4$ $12 × (\frac{5}{6} + 50\% - \frac{1}{3})$
$14.42 ÷ 3.5 ÷ 2$ $(\frac{5}{16} + \frac{1}{24}) × 8 + \frac{2}{3}$ $\frac{7}{8} × [(\frac{1}{2} + \frac{3}{4}) ÷ \frac{15}{32}]$
$\frac{5}{12} ÷ 8 + \frac{1}{8} × \frac{7}{12}$ $40 ÷ 3 - \frac{2}{3} × 4$ $12 × (\frac{5}{6} + 50\% - \frac{1}{3})$
$14.42 ÷ 3.5 ÷ 2$ $(\frac{5}{16} + \frac{1}{24}) × 8 + \frac{2}{3}$ $\frac{7}{8} × [(\frac{1}{2} + \frac{3}{4}) ÷ \frac{15}{32}]$
答案
二、$\frac{1}{8}$ $\frac{32}{3}$ 12
2.06 $\frac{7}{2}$ $\frac{7}{3}$
2.06 $\frac{7}{2}$ $\frac{7}{3}$
