Question

Va rog ajutati-ma !!!!!!!!!!!
Dau coronita!!!!!!!!!
a)Rezultatul calcului (b/a ) la puterea 0 +(b/a)la puterea -1 +(b/a) la puterea -2=........ .................

b)1/2 la puterea n-1 -1/2 la puterea n...............

Answer 1

(b/a)⁰+(b/a)⁻¹+(b/a)⁻²=
=1+(a/b)¹+(a/b)²=
=1+a/b+a²/b²=
=(b²+ab+a²)/b²


(1/2)^(n-1)-(1/2)^n=
=(1/2)^n * [(1/2)^(-1)-(1/2)^0]=
=(1/2)^n*(2-1)=
=1/2^n