Question

номер 4 пожалуйста помогите ​

Answer 1

$(7 \frac{2}{5} + 6.4) \div (5.2 - 2 \frac{3}{10} ) = (7.4 + 6.4) \div (5.2 - 2.3) =\\= 13.8 \div 2.9 = \frac{138 \times 10}{10 \times 29} = \frac{138}{29} = 4 \frac{22}{29}$