1. 直接写出得数。
2.7 + 6.3 =
0.22 × 60 =
6 : $\frac{6}{17}$ =
4.5 ÷ 0.3 - 0.5 =
7.6 ÷ 0.76 =
0.7 - 0.03 =
2.2 : 8.8 =
(0.15 + 0.15) × 0.2 =
1.8 × 0.6 =
3 ÷ 20 =
$\frac{1}{2}$ : $\frac{1}{5}$ =
0.3 ÷ 0.1 × 0.8 =
2.6 ÷ 0.2 =
2 : 0.05 =
2.04 : 0.4 =
1.1 - 2.7 ÷ 27 =
$\frac{3}{4}$ × $\frac{6}{5}$ =
$\frac{9}{14}$ : $\frac{3}{28}$ =
$\frac{3}{4}$ × $\frac{36}{25}$ =
$\frac{5}{6}$ - $\frac{1}{4}$ × $\frac{2}{3}$ =
$\frac{5}{8}$ ÷ $\frac{4}{7}$ =
10 ÷ $\frac{3}{5}$ =
0.01 : 0.23 =
$\frac{5}{4}$ + $\frac{3}{8}$ - $\frac{1}{4}$ =
$\frac{1}{6}$ ÷ $\frac{6}{11}$ =
$\frac{1}{2}$ - $\frac{2}{5}$ =
$\frac{15}{8}$ : 3 =
4 ÷ $\frac{29}{27}$ ÷ $\frac{3}{29}$ =
$\frac{1}{4}$ + $\frac{4}{7}$ =
$\frac{8}{9}$ ÷ $\frac{20}{27}$ =
4.5 : 3.5 =
$\frac{4}{9}$ × (99 + 1) =

1. 9
13.2
17
14.5
10
0.67
$\frac{1}{4}$
0.06
1.08
0.15
$\frac{5}{2}$
2.4
13
40
5.1
1
$\frac{9}{10}$
6
$\frac{27}{25}$
$\frac{2}{3}$
$\frac{35}{32}$
$\frac{50}{3}$
$\frac{1}{23}$
$1\frac{3}{8}$
$\frac{11}{36}$
$\frac{1}{10}$
$\frac{5}{8}$
36
$\frac{23}{28}$
$\frac{6}{5}$
$\frac{9}{7}$
$\frac{400}{9}$

2. 用竖式计算，带☆的要验算。
4.65×0.52=
☆3.06÷3.6=
0.65×0.142≈
（得数保留两位小数）
3.8×0.16=
☆50.7÷3.25=
10.5÷0.224≈
（得数保留两位小数）

2. 2.418 0.85 0.09
0.608 15.6 46.88
竖式及验算略

已知$A:B=3:4,B:C=5:6$,那么$A、B、C$三个数的比是（）。

15 : 20 : 24