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a = [tex] \frac{7}{2*9} [/tex] + [tex] \frac{11}{9*20} [/tex] + [tex] \frac{13}{20*33} [/tex] + [tex] \frac{17}{33*50} [/tex]. Aflati a.

Răspuns :

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