给我10道简单的数学题目，涵盖加减乘除四种运算并包含小数点。
1. 3.5 + 2 = 
2. 8 - 4.2 = 
3. 2.3 × 0.5 = 
4. 9 ÷ 3.6 = 
5. 2.5 + 1.6 - 0.8 = 
6. 5.4 - 2.9 + 1.1 = 
7. 0.7 × 0.8 ÷ 2 = 
8. 3.2 + 4.5 × 2.1 = 
9. 6.4 - 2.3 × 1.5 = 
10. 7.6 ÷ 2 - 1.2 =