a) [tex][- \frac{3}{4} - \frac{1}{8} * \frac{4}{3} ] * \frac{8}{13} = ( - \frac{3}{4} - \frac{1}{6} ) * \frac{8}{13} = (- \frac{9}{12} - \frac{2}{12} )* \frac{8}{13} = - \frac{11}{12} * \frac{8}{13} = -22/39
[tex] \frac{1}{1*2} = \frac{2-1}{1*2} = \frac{2}{1*2} - \frac{1}{1*2} = \frac{1}{1} - \frac{1}{2} [/tex]=
analog 1/2*3=1/2-1/3
1/3*4=1/3-1/4
.....................................
1/99*100=1/99-1/100
daca le adun membru cu membru se vor reduce toti termenii, exceptie fac primul termen si ultimul
= 1- 1/100=99/100
99/100* (3/5)^7*(5/3)^5=99/100* (3/5)^2=11/4
