Задание 158 Вариант 2 Самостоятельная работа ГДЗ Дидактические материалы Чесноков 5 класс (Математика)
Используем соотношения единиц площади:
$$1\ \text{га}=100\ \text{а}=10\,000\ \text{м}^2,$$ $$1\ \text{м}^2=100\ \text{дм}^2,$$ $$1\ \text{км}^2=100\ \text{га}.$$
$$12\ \text{га}=12\cdot 10\,000\ \text{м}^2=120\,000\ \text{м}^2.$$
$$8\ \text{га}\ 7\ \text{а}=80\,000\ \text{м}^2+700\ \text{м}^2=80\,700\ \text{м}^2.$$
$$3\,500\ \text{дм}^2=3\,500:100\ \text{м}^2=35\ \text{м}^2.$$
$$17\ \text{га}=17\cdot 100\ \text{а}=1\,700\ \text{а}.$$
$$8\ \text{га}\ 7\ \text{а}=800\ \text{а}+7\ \text{а}=807\ \text{а}.$$
$$3\,500\ \text{м}^2=3\,500:100\ \text{а}=35\ \text{а}.$$
$$8\,400\,000\ \text{м}^2=8\,400\,000:10\,000\ \text{га}=840\ \text{га}.$$
$$57\,000\ \text{а}=57\,000:100\ \text{га}=570\ \text{га}.$$
$$7\ \text{км}^2=7\cdot 100\ \text{га}=700\ \text{га}.$$
$$1\,850\ \text{а}=1\,800\ \text{а}+50\ \text{а}=18\ \text{га}\ 50\ \text{а}.$$
$$324\,500\ \text{м}^2=320\,000\ \text{м}^2+4\,500\ \text{м}^2=32\ \text{га}\ 45\ \text{а}=32\ \text{га}\ 45\ \text{а}.$$
