Question

алгебра 7 класс помогите пожалуйста

Answer 1

$1)0.036 = \frac{36}{1000} = \frac{9}{250} \\ \\ 2) \frac{5}{6} + \frac{7}{20} = \frac{5 \times 10}{60} + \frac{7 \times 3}{60} = \frac{50 + 21}{60} = \frac{71}{60} = 1 \frac{11}{60} \\ \\ 3) \: \: \: 1)25 - ( - 13) = 25 + 13 = 38 \\ \: \: \: \: \: \: \: 2)0.7 \times ( - 0.3) = - 0.21 \\ \: \: \: \: \: \: \: 3) 0.8 \times ( - 0.5) = - 0.4 \\ \\ 4)6.2y + 5.2 = 3.2y - 0.2 \\ 6.2y - 3.2y = - 0.2 - 5.2 \\ 3y = - 5.4 \\ y = - 5.4 \div 3 \\ y = - 1.8$