1. 直接写出得数。
实际用时：分钟
$496 - 254 =$
$600 ÷ 30 =$
$27\% × 100 =$
$4.5 × 20 =$
$78 ÷ 100 =$
$65\% + 135\% =$
$404 × 20 =$
$104 + 278 =$
$95 : 5 =$
$1.5 : 9 =$
$\frac{9}{14} : \frac{2}{7} =$
$\frac{3}{10} : 0.3 =$
$\frac{1}{18} + \frac{5}{6} =$
$\frac{5}{9} × \frac{7}{9} =$
$\frac{25}{23} ÷ 50 =$
$\frac{9}{16} - \frac{3}{16} =$
$1 - \frac{3}{5} =$
$15 ÷ \frac{3}{10} =$
$\frac{1}{3} × 15 =$
$\frac{1}{9} + \frac{7}{18} =$
$\frac{1}{3} + \frac{1}{5} + \frac{2}{3} =$
$125\% × 8 × 2.5 =$
$\frac{1}{3} × \frac{3}{7} ÷ \frac{1}{3} =$
$117\% × 0 ÷ 243\% =$

1. $242$ $20$ $27$ $90$
$0.78$ $200\%$ $8080$ $382$
$19$ $\frac{1}{6}$ $\frac{9}{4}$ $1$
$\frac{8}{9}$ $\frac{35}{81}$ $\frac{1}{46}$ $\frac{3}{8}$
$\frac{2}{5}$ $50$ $5$ $\frac{1}{2}$
$\frac{6}{5}$ $25$ $\frac{3}{7}$ $0$

2. 计算下面各题。
$1950÷(1-35\%)$
$9.6×0.38+9.62×9.6$
$\frac{8}{13}÷[\frac{3}{2}×(1-\frac{2}{3})]$

2. $3000$ $96$ $\frac{16}{13}$

3. 看图列式计算。

3. $36÷(1-25\%)=48(\mathrm{kg})$
$120×(1-\frac{3}{5})=48(\mathrm{个})$

计算:$\frac{6}{75}+\frac{7}{75}+\frac{8}{75}+\dots+\frac{63}{75}+\frac{64}{75}$

$\frac{413}{15}$