Срочно !!! пожалуйста !! 10÷(-1/2)=... -0,6÷(-1/3)=...1/3+0,25=...2/3÷0,1=...дам 20 балов...

Решите задачу:

$10 \div ( - \frac{1}{2} ) = - 10 \times 2 = - 20 \\ - 0.6 \div ( - \frac{1}{3} ) = - \frac{3}{5} \div ( - \frac{1}{3} ) = \frac{3}{5} \times 3 = 1.8 \\ \frac{1}{3} + 0.25 = \frac{1}{3} + \frac{1}{4} = \frac{7}{12} \\ \frac{2}{3} \div 0.1 = \frac{2}{3} \div \frac{1}{10} = \frac{2}{3} \times 10 = \frac{20}{3}$