1. 直接写出得数。
3.7×6=
9.5×2=
11×0.05=
14.7+3.89−4.7=
4.3−0.25=
4.7÷0.47=
0.77÷77=
6.26−3.65−1.35=
5×2.7=
6.6÷2=
3.8×7=
1.25×0×8=
10−2.7=
1.4+0.76=
7.85+8.25=
5.6÷0.7×0.02=
2.82+28.2=
0.5÷2=
0.4×2.9=
9.3−(2.3+3.09)=
91−30.1=
8.4×0.2=
10.87−2.7=
9.83−9.8+0.03=
2.6÷$\frac{1}{5}$=
$\frac{2}{3}$×$\frac{4}{5}$=
0.375÷$\frac{3}{8}$=
$\frac{3}{4}$×12×$\frac{7}{3}$=
$\frac{1}{2}$÷$\frac{2}{3}$=
$\frac{3}{7}$÷$\frac{9}{14}$=
$\frac{1}{5}$−$\frac{1}{7}$=
$\frac{1}{3}$−$\frac{1}{3}$×$\frac{1}{3}$=

1. 22.2 19 0.55 13.89
4.05 10 0.01 1.26
13.5 3.3 26.6 0
7.3 2.16 16.1 0.16
31.02 0.25 1.16 3.91
60.9 1.68 8.17 0.06
13 $\frac{8}{15}$ 1 21
$\frac{3}{4}$ $\frac{2}{3}$ $\frac{2}{35}$ $\frac{2}{9}$

2. 用竖式计算。（除不尽的保留两位小数）
3.05×1.6=
1.3×29.2=
6.43÷0.09≈
53.8÷5.8≈
88.4÷45≈
2.496÷0.12=

2. 4.88 37.96 71.44
9.28 1.96 20.8
竖式略

找出规律后直接写出后面几题的商,并求出它们的近似值(保留两位小数)。
(1) $1÷ A = 0.\dot{0}\dot{3}$
(2) $2÷ A = 0.\dot{0}\dot{6}$
(3) $3÷ A = 0.\dot{0}\dot{9}$
(4) $4÷ A = \_\_\_\_\_\_ \approx \_\_\_\_\_\_$
(5) $5÷ A = \_\_\_\_\_\_ \approx \_\_\_\_\_\_$
(6) $6÷ A = \_\_\_\_\_\_ \approx \_\_\_\_\_\_$
(7) $7÷ A = \_\_\_\_\_\_ \approx \_\_\_\_\_\_$
(8) $8÷ A = \_\_\_\_\_\_ \approx \_\_\_\_\_\_$
(9) $9÷ A = \_\_\_\_\_\_ \approx \_\_\_\_\_\_$

(4) $0.\dot{1}\dot{2}$ 0.12
(5) $0.\dot{1}\dot{5}$ 0.15
(6) $0.\dot{1}\dot{8}$ 0.18
(7) $0.\dot{2}\dot{1}$ 0.21
(8) $0.\dot{2}\dot{4}$ 0.24
(9) $0.\dot{2}\dot{7}$ 0.27