Question

Решить только 103 номер пэжэ

Answer 1

$1.8 \times \frac{2}{9} + 1.8 \div \frac{2}{9} = 1.8 \times \frac{2}{9 } + 1.8 \times \frac{9}{2} = \\ = 1.8 \times ( \frac{2}{9} + \frac{9}{2} ) = \frac{9}{5} \times \frac{4 + 81}{18} = \\ = \frac{9 \times 85}{5 \times 18} = \frac{17}{2} = 8.5 \\ \frac{17}{2} \div \frac{40\%}{100\%} = \frac{17 \times 5}{2 \times 2} = \frac{85}{4} = 21.25$