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一、口算。
$\frac{3}{4} × \frac{8}{33} =$
$3 - \frac{2}{9} =$
$\frac{3}{4} + \frac{3}{7} =$
$7.5 - 2.9 =$
$40 × 25\% =$
$\frac{4}{7} - \frac{4}{21} =$
$\frac{9}{16} ÷ \frac{3}{8} =$
$\frac{3}{4} × \frac{8}{33} =$
$\frac {2}{11}$
$5.5 + 0.45 =$5.95
$5 ÷ 5\% =$100
$3 - \frac{2}{9} =$
$2\frac {7}{9}$
$0.25 × 800 =$200
$\frac{1}{11} + \frac{3}{22} =$$\frac {5}{22}$
$\frac{3}{4} + \frac{3}{7} =$
$\frac {33}{28}$
$3 ÷ 0.15 =$20
$6.3 - 1.09 =$5.21
$7.5 - 2.9 =$
4.6
$\frac{5}{12} × \frac{7}{10} =$$\frac {7}{24}$
$0.95 ÷ 19 =$0.05
$40 × 25\% =$
10
$7 - 0.98 =$6.02
$38 ÷ \frac{19}{20} =$40
$\frac{4}{7} - \frac{4}{21} =$
$\frac {8}{21}$
$4 ÷ 30\% =$$\frac {40}{3}$
$3.76 + 0.34 =$4.1
$\frac{9}{16} ÷ \frac{3}{8} =$
$\frac {3}{2}$
$\frac{1}{3} × \frac{3}{10} =$$\frac {1}{10}$
$\frac{1}{5} - \frac{1}{7} =$$\frac {2}{35}$
答案
一、$\frac {2}{11}$ 5.95 100
$2\frac {7}{9}$ 200 $\frac {5}{22}$
$\frac {33}{28}$ 20 5.21
4.6 $\frac {7}{24}$ 0.05
10 6.02 40
$\frac {8}{21}$ $\frac {40}{3}$ 4.1
$\frac {3}{2}$ $\frac {1}{10}$ $\frac {2}{35}$
$2\frac {7}{9}$ 200 $\frac {5}{22}$
$\frac {33}{28}$ 20 5.21
4.6 $\frac {7}{24}$ 0.05
10 6.02 40
$\frac {8}{21}$ $\frac {40}{3}$ 4.1
$\frac {3}{2}$ $\frac {1}{10}$ $\frac {2}{35}$
二、计算下面各题，怎样简便就怎样计算。
$9 ÷ \frac{11}{13} + 2 ÷ \frac{11}{13}$ $(\frac{1}{4} + \frac{2}{3}) ÷ \frac{1}{24}$ $4 ÷ 50\% - 25\% × 40\%$
$7.4 - (2.4 - 0.4 × 5)$ $76.5 ÷ [(2.9 - \frac{6}{5}) ÷ \frac{1}{3}]$
$9 ÷ \frac{11}{13} + 2 ÷ \frac{11}{13}$ $(\frac{1}{4} + \frac{2}{3}) ÷ \frac{1}{24}$ $4 ÷ 50\% - 25\% × 40\%$
$7.4 - (2.4 - 0.4 × 5)$ $76.5 ÷ [(2.9 - \frac{6}{5}) ÷ \frac{1}{3}]$
答案
二、13 22 7.9
7 15
7 15
