Найдите значение выражения 100 - 81 1/7 - 6,5 - 0,01Помогите!!

Решите задачу:

$100 - 81\frac{1}{7} - 6.5 - 0.01 = \\ = 100 - \frac{568}{7} - 6.5 - 0.01 = \\ = \frac{100}{1} \times \frac{7}{7} - \frac{568}{7} - 6.5 - 0.01 = \\ = \frac{100 \times 7}{7} - \frac{568}{7} - 6.5 - 0.01 = \\ = \frac{100 \times 7 - 1 \times 568}{7} - 6.5 - 0.01 = \\ = \frac{700 - 568}{7} - 6.5 - 0.01 = \\ = \frac{132}{7} - 6.5 - 0.01 = \\ = \frac{132 - 6.5 \times 7 - 0.01 \times 7}{7} = \\ = \frac{132 - 45.5 - 0.07}{7} = \\ = \frac{86.5 - 0.07}{7} = \frac{86.43}{7} = 12.35$