一、直接写出得数。（共32分）
$\frac{1}{4} - \frac{1}{8} =$
$24 ÷ \frac{8}{3} =$
$\frac{8}{9} × 27 =$
$\frac{5}{7} - \frac{2}{5} + \frac{2}{7} =$
$10 - 0.2 =$
$8.4 ÷ 4.2 =$
$0.35 × 6 =$
$1 ÷ 2.5 × 0.4 =$
$0.6 × 45 =$
$26 ÷ \frac{1}{5} =$
$\frac{1}{7} ÷ \frac{9}{14} =$
$\frac{7}{9} + \frac{7}{9} × 2 =$
$\frac{1}{5} + \frac{4}{3} =$
$\frac{4}{9} × \frac{1}{8} =$
$15.25 ÷ 5 =$
$( \frac{5}{6} - \frac{3}{4} ) ÷ \frac{1}{12} =$
$2.48 ÷ 0.8 =$
$9.09 × 5 =$
$\frac{7}{26} × \frac{13}{42} =$
$\frac{6}{7} ÷ \frac{3}{14} + \frac{3}{16} =$
$0.375 × 24 =$
$0.6 ÷ 0.15 =$
$0.48 × \frac{3}{4} =$
$1.6 × 9 + 1.6 =$
$4.5 ÷ 50 =$
$\frac{5}{14} × \frac{7}{25} =$
$\frac{4}{9} + \frac{1}{2} =$
$3.14 × 2^2 × 0.1 =$
$15.15 ÷ 15 =$
$0.7 × 2.9 =$
$3.5 ÷ \frac{7}{2} =$
$\frac{1}{3} + \frac{4}{5} + \frac{2}{3} =$

1.$\frac{1}{8}$
2.$9$
3.$24$
4.$\frac{3}{5}$
5.$9.8$
6.$2$
7.$2.1$
8.$0.16$
9.$27$
10.$130$
11.$\frac{2}{9}$
12.$\frac{7}{3}$
13.$\frac{23}{15}$
14.$\frac{1}{18}$
15.$3.05$
16.$1$
17.$3.1$
18.$45.45$
19.$\frac{1}{12}$
20.$4\frac{3}{16}$
21.$9$
22.$4$
23.$0.36$
24.$16$
25.$0.09$
26.$\frac{1}{10}$
27.$\frac{17}{18}$
28.$1.256$
29.$1.01$
30.$2.03$
31.$1$
32.$1\frac{4}{5}$

二、用竖式计算，带☆的要验算。（共20分）
1.7×3.36=
4.05÷2.5=
☆0.46×4.5=
5.08×0.48≈
（得数保留两位小数）
19.5÷0.25=
☆0.35÷0.14=

1. 5.712
2. 1.62
3. 2.07
4. 2.44
5. 78
6. 2.5
竖式及验算略

三、计算下面各题，怎样算简便就怎样算。（共24分）
$\frac{1}{9}×\frac{5}{13}+\frac{1}{13}÷9$
$72×(\frac{5}{12}+\frac{1}{3})÷\frac{2}{9}$
$\frac{3}{17}×35.4 - 1.4÷\frac{17}{3}$
$24.8×101 - 24.8$
$(\frac{3}{20}+\frac{11}{10})÷9×\frac{4}{15}$
$\frac{3}{14}÷[\frac{8}{21}×(\frac{5}{6}-\frac{1}{3})]$

1.$\frac{2}{39}$
2.$243$
3.$6$
4.$2480$
5.$\frac{1}{27}$
6.$\frac{9}{8}$