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rezolvati in multimea numerelor reale ecuatia 3 la 2-x = 1 pe 9


Răspuns :



3²⁻ˣ=1/9
3²⁻ˣ=1/3²
3²⁻ˣ=3⁻²

2-x=-2
x=4
3² - x = 1 / 9
9 - x = 1 / 9
(81 - 9x) : 9 = 1 / 9
81 - 9x = 1
9x = 80, x = 80 / 9.