Question

обчисліть 15:6-0,5*0,8

Answer 1

Пошаговое объяснение:

$15 \div 6 - 0.5 \times 0.8 = 2 \frac{1}{10}$

$1)15 \div 6 = \frac{15}{6} = \frac{5 \times 3}{2 \times 3} = \frac{5}{2} = \frac{2 \times 2 + 1}{2} = 2 \frac{1}{2}$

$2)0.5 \times 0.8 = 0.4$

$3)2 \frac{1}{2} - 0.4 = 2 \frac{1}{2} - \frac{4}{10} = \frac{1 + 2 \times 2}{2} - \frac{4}{10} = \frac{5}{2} - \frac{4}{10} = \frac{5 \times 5}{2 \times 5} - \frac{4 \times 1}{10 \times 1} = \frac{25}{10} - \frac{4}{10} = \frac{25 - 4}{10} = \frac{21}{10} = \frac{2 \times 10 + 1}{10} 2 \frac{1}{10}$