Răspuns:
1/94(24/25-1/50)=1/94·47/50=1/100
√1/100=1/10
am folosit formula 1/1·2+1/2·3+...+1/n(n+1)=n/(n+1)
1/1·2+1/2·3+...+1/24·25=24/25
1/24·25+1/25·26+...1/49·50=49/50-24/25=47/50
Explicație pas cu pas:
