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Determinati, in fiecare caz, numarul natural n, stiind ca propozitia prezentata este adevarata: a) 5/4=n/8; b)n/2=4/8; c) 6/4=3/n; d)2/n=5/25; e) 2^n/ 14=8/7; f) 6/3^n+1; g) 1/2=5^n+2/50; h)2/8=1/7^n-1