Помогите решить пример

Решите задачу:

$1)0.128 \div 3.2 = 0.04 \\ 2)0.04 + 0.86 = 0.9 \\ 3) \frac{5}{6} \times 1.2 = 1 \\ 4)1 + 0.8 = 1.8 \\ 5)0.9 \div 1.8 = 0.5 \\ 6)1 \times \frac{32}{63} - \frac{13}{21} = \frac{95}{63} - \frac{39}{63} = \frac{56}{63} = \frac{8}{9} \\ 7) \frac{8}{9} \times 3.6 = 3.2 \\ 8)0.505 \times \frac{2}{5} = 0.202 \\ 9)0.202 - 0.002 = 0.2 \\ 10)3.2 \div .02 = 16 \\ 11)5 \times 0.5 \times 16 = 40$