Question

Dau coroana!!!!!!!!!!!

Answer 1

10) (1/2-1/3+1/3-1/4+1/4-1/5-...+1/26-1/27)/34/27

(1/2-1/27)/34/27 = 25/54 * 27/34 = 25/18*9/34 = 25/2*1/34 = 15/68.

11) (3/7)/(3/7)^2+3+...+25/((3/7)^46)^30)

(3/7)/(3/7)^324/(3/7)^1380

(3/7)^1-324-1380 = (3/7)^-1703=(7/3)^1703;

12)

a) 2^3 = 8;

b) (-3)^2 = -3*-3 = 9.

c) (7/2)^5 = 7^5/2^5;

d) (-11/4)^2 sau (11/4)^2. E aceeasi chestie pentru ca ridicand la patrat tot cu + iti va da.