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(5la puterea7+5la puterea 8+ 5 la puterea 9) :5 la puterea6=

Răspuns :

dam factor comun
5^7(1+5^1+5^2) / 5^6 =
5^7 * (1+5+25) / 5^6 =
5^7 * 31 / 5^6 = 5^1 *31 = 5*31 = 155