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Ответ:
Смотри ниже
Объяснение:
Правило: при одинаковых основаниях в случае умножения мы показатели прибавляем:
a) ![x^{3a + 4 +8} = x^{3a + 12}](https://tex.z-dn.net/?f=x%5E%7B3a%20%2B%204%20%2B8%7D%20%3D%20x%5E%7B3a%20%2B%2012%7D)
б) ![x^{5a + 11 + (-3a) + 2} = x^{2a + 13}](https://tex.z-dn.net/?f=x%5E%7B5a%20%2B%2011%20%2B%20%28-3a%29%20%2B%202%7D%20%3D%20x%5E%7B2a%20%2B%2013%7D)
в) ![x^{-4x-8 + 12 + 6x} = x^{2x + 4}](https://tex.z-dn.net/?f=x%5E%7B-4x-8%20%2B%2012%20%2B%206x%7D%20%3D%20x%5E%7B2x%20%2B%204%7D)
6+9-2,31r=2+6-2,41r;
15-2,31r=8-2,41r;
2,41r-2,31r=8-15;
0,1r=-7;
r= -7/0,1
r= -70