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Ingrid21
a fost răspuns

x+y=? daca x=1/3+1/4+...+1/20; y=2/3+3/4+...+19/20

Răspuns :

Renatemambouko
x+y=? daca x=1/3+1/4+...+1/20; y=2/3+3/4+...+19/20
x+y=1/3+1/4+...+1/20+2/3+3/4+...+19/20=
le grupam
=(1/3+2/3)+(1/4+3/4)+...+(1/20+19/20)=1+1+....+1=18
(nr de termeni =20-3+1=18)