7. В данных выражениях вместо x запишите такое число, что-бы получилось верное равенство.


a) (3^6)^x = 3^18, ................ x = ______

б) (a^x)^14 = 3^70, .............. x = ______

в) (7^4)^x ⋅ 7^9 = 7^21, ....... x = ______
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