Решите 7 пример,20 баллов даю
1)9/14 - ( - 5/21 ) =9/14 + 5/21 =(9 × 3 + 5 × 2)/42 = 27/42 + 10/42 = 37/42 2) 37/42 ÷ ( - 2 9/14 ) = 37/42 ÷ ( - 37/14) = 37/42 × ( - 14/37) = - 1/3 ответ: - 1/3
восьмой решишь?
1)9/14+5/21=27/42+10/42=37/42 2)37/42:(-2 9/14)=-37/42*14/37=-1/3