Question

(－9.7+7.1):(-1 целая четыре девятых)​

Answer 1

$(- 9.7 + 7.1) \div 1 \frac{4}{9} = - 2.6 \div \frac{13}{9} = \\ = - \frac{26}{10} \times \frac{9}{13} = \frac{13}{5} \times \frac{9}{13} = \frac{9}{5} = \\ = 1 \frac{4}{5} = 1.8$