四、计算。（共32分）
1.直接写得数。（6分）
20×1.8=
0×0.995=
5.6÷0.7=
3.6÷0.12=
30.5+5=
0.27-0.2=
0.8×0.7=
3.5÷0.35=
0÷4.61=
2.8×100=
0.32×5=
0.24÷0.6=

20×1.8=36
0×0.995=0
5.6÷0.7=8
3.6÷0.12=30
30.5+5=35.5
0.27-0.2=0.07
0.8×0.7=0.56
3.5÷0.35=10
0÷4.61=0
2.8×100=280
0.32×5=1.6
0.24÷0.6=0.4

2. 用竖式计算。(8分)
4.8×0.35
6.04×3.7
9.12÷1.9
3.82÷1.1
（用循环小数表示）

3. 用你喜欢的方法计算下面各题。(12分)
4.36+3.2÷2.5
2.5×2.18×0.4
34.2×2.01-0.01×34.2
9.9×2.8+0.28
8.7÷0.2÷0.5
4.8×5.62+0.52×56.2

4.36+3.2÷2.5
=4.36+1.28
=5.64
2.5×2.18×0.4
=2.5×0.4×2.18
=1×2.18
=2.18
34.2×2.01-0.01×34.2
=34.2×(2.01-0.01)
=34.2×2
=68.4
9.9×2.8+0.28
=9.9×2.8+2.8×0.1
=2.8×(9.9+0.1)
=2.8×10
=28
8.7÷0.2÷0.5
=8.7÷(0.2×0.5)
=8.7÷0.1
=87
4.8×5.62+0.52×56.2
=4.8×5.62+5.2×5.62
=5.62×(4.8+5.2)
=5.62×10
=56.2