1. 直接写出得数。
0.2 + 0.8 =
1 - 0.99 =
3.5 × 10 =
20 - 6.25 × 2 =
1.6 × 3 =
7.2 ÷ 0.9 =
4 ÷ 0.5 =
9.6 ÷ 0.8 - 1.3 =
3 - 0.26 =
0.125 × 40 =
0.6 + 0.8 =
4 - 2 ÷ 0.8 =
0.33 ÷ 1.1 =
5 + 3.9 =
6.48 - 5.74 =
0.25 + 0.25 ÷ 5 =
$\frac{7}{8} × 3 =$
$\frac{3}{10} + 0.4 =$
$\frac{4}{35} × \frac{7}{4} =$
$3.5 × \frac{2}{9} + \frac{2}{9} =$
$4 ÷ \frac{4}{7} =$
$0.5 - \frac{1}{8} =$
$\frac{4}{3} - \frac{5}{9} =$
$15 ÷ (1 - \frac{5}{6}) =$
$\frac{2}{9} × 2.25 =$
$\frac{3}{28} × \frac{8}{9} =$
$\frac{11}{2} ÷ \frac{3}{7} =$
$8.1 - \frac{3}{5} - \frac{7}{5} =$
$\frac{2}{29} ÷ \frac{30}{29} =$
$\frac{11}{21} ÷ \frac{3}{7} =$
$\frac{1}{9} × \frac{3}{4} =$
$\frac{4}{7} ÷ 7 ÷ \frac{4}{7} =$

1. 1
0.01
35
7.5
4.8
8
8
10.7
2.74
5
1.4
1.5
0.3
8.9
0.74
0.3
$\frac{21}{8}$
0.7
$\frac{1}{5}$
1
7
$\frac{3}{8}$
$\frac{7}{9}$
90
0.5
$\frac{2}{21}$
$\frac{77}{6}$
6.1
$\frac{1}{15}$
$\frac{11}{9}$
$\frac{1}{12}$
$\frac{1}{7}$

2. 用竖式计算，带☆的要验算。
3.58×0.45=
3.9×0.78≈
（得数保留一位小数）
☆50.7÷3.25=
4.032÷18=
1.74×1.6=
15.08÷5.6≈
（得数保留三位小数）

2. 1.611
3.0
15.6
0.224
2.784
2.693
竖式及验算略

将0.2,0.5和4这三个数填入(□－□)÷□中,则该式的值最大是()。

17.5