一、口算。
4.8×2.5 =
2.01 - 0.09 =
1.2×8÷5 =
4.2 + 2.8 =
29.7÷100 =
(0.4 - 0.2)×4.8 =
1.05÷0.7 =
21.9 + 9.1 =
2.4÷4 + 5.6 =
0.65×0.2 =
9.8÷70 =
20 + 3.7 + 7.3 =
0.74 + 0.36 =
1 - 0.54 =
5×(0.75÷1.5) =
6.3÷2.1 =
2.6×0.05 =
(1 + 0.1)×0.1 =
4.86 + 2.14 =
0.4÷5 =
0.08×8 + 1.6 =
0.95÷5 =
8.1 - 8.01 =
6.8 + 2.4÷3 =
2.6×0.01 =
9.6÷0.3 =
1.5 + 0.25×4 =
0.65 - 0.45 =
20×0.54 =
7.5 - 0.38 - 1.62 =

12 1.92 1.92
7 0.297 0.96
1.5 31 6.2
0.13 0.14 31
1.1 0.46 2.5
3 0.13 0.11
7 0.08 2.24
0.19 0.09 7.6
0.026 32 2.5
0.2 10.8 5.5

二、计算下面各题，怎样简便就怎样计算。
(2.36 + 12÷2.4)×0.8
5.6×0.25 + 4.4×0.25
(9 - 0.55)÷(2.15 + 4.35)

5.888 2.5 1.3