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Răspuns:
Explicație pas cu pas:
a)√2·24·25/2·(1-1/2+1/2-1/3+.............+1/24-1/25)=
=√24·25·(1-1/25)=√24·25·24/25=√24²=24
b)√1·1/82·(1-1/2+1/2-1/3+.....+1/81-1/82)=√81/82²=9/82
c) 1-1/√2+1/√2-1/√3+............+1/√63-1/√64=1-1/8=7/8
