1. 直接写出得数。
0.4×0.5=
0.9×0.9=
1.8×0.1=
3.2×0.7×10=
2.3×0.9=
0.8×2.1=
0.7×0.8=
0.6×80×0.3=
2.8×0.4=
2.2×0.7=
3.6×0.8=
5.1×0.2×0.1=
3.1×0.2=
1.5×0.9=
3.2×0.05=
7.5×100×0.01=
3.2×0.3=
2.4×0.5=
0.19×0.4=
0.125×8×0.2=
5.4×0.3=
4.2×0.6=
1.05×0.2=
0.7×0.8×0.3=
0.6×1.3=
1.6×0.2=
0.5×2.8=
0.4×0.02×1.3=
4.8×0.2=
5.2×0.4=
7.2×0.3=
0.5×0.3×0.8=

0.2 0.81 0.18 22.4 2.07 1.68 0.56 14.4 1.12 1.54 2.88 0.102 0.62 1.35 0.16 7.5 0.96 1.2 0.076 0.2 1.62 2.52 0.21 0.168 0.78 0.32 1.4 0.0104 0.96 2.08 2.16 0.12

2. 用竖式计算。
0.093×3.6=
0.54×1.2=
0.98×0.17=
0.032×1.5=
0.75×1.02=
2.52×0.26=

0.3348 0.648 0.1666 0.048 0.765 0.6552 竖式略

0.093×3.6=0.3348
```
0.093
× 3.6
------
0558
279
------
0.3348
```
0.54×1.2=0.648
```
0.54
×1.2
------
108
54
------
0.648
```
0.98×0.17=0.1666
```
0.98
×0.17
------
686
98
------
0.1666
```
0.032×1.5=0.048
```
0.032
× 1.5
------
160
32
------
0.0480
```
0.75×1.02=0.765
```
0.75
×1.02
------
150
000
75
------
0.7650
```
2.52×0.26=0.6552
```
2.52
×0.26
------
1512
504
------
0.6552
```

(1)若$a= 0.\underbrace{00…05}_{100个0}$,$b= 0.\underbrace{00…03}_{100个0}$,则$a× b= (\quad)$。
(2)若$a= 0.\underbrace{00…08}_{2025个0}$,$b= 0.\underbrace{00…025}_{2024个0}$,则$a× b= (\quad)$。