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Vă rog ex. 8 ........

Vă Rog Ex 8 class=

Răspuns :

a)3ⁿ⁺²/3ⁿ⁺¹=3ⁿ⁺¹x3/3ⁿ⁺¹=3
b)(3²ⁿ+3ⁿ)/(3²ⁿ+2x3ⁿ)=3ⁿ(3ⁿ+1)/3ⁿ(3ⁿ+2)=(3ⁿ+1)/(3ⁿ+2)
c)5ⁿx7ⁿ(5²+7)/5ⁿ⁺¹x7ⁿ(7+5)=5ⁿx32/5ⁿx5x12=32/60=8/15
d)5ⁿ(1+5+25+125)/5ⁿ⁺¹(1+25)=5ⁿx156/5ⁿx5x26=156/130=78/65