Question

a = $\frac{7}{2*9}$ + $\frac{11}{9*20}$ + $\frac{13}{20*33}$ + $\frac{17}{33*50}$. Aflati a.

Answer 1

a=7/2*9+11/9*20+13/20*33+17/33*50=
=(7*10+11)/9*20+(13*5+17*2)/100*33=
=81/9*20+99/100*33=
=9/20+3/100=
=(9*5+3)/100=48/100=12/25=0,48