=>2(1/1*2+1/2*3+...+1/n(n+1))=49/50
=>1-1/2+1/2-1/3+...+1/n-1/n+1=49/100
=>1-1/n+1=49/100
=>1/n+1=51/100
=>n+1=100/51
=>n=49/51
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=>2(1/1*2+1/2*3+...+1/n(n+1))=49/50
=>1-1/2+1/2-1/3+...+1/n-1/n+1=49/100
=>1-1/n+1=49/100
=>1/n+1=51/100
=>n+1=100/51
=>n=49/51
A=1/2+1/4+1/6+1/8 .......+1/n biết a là 49/50.Tìm n
A=1/2+1/4+1/6+1/8.......+ 1/n biết A =49/50 .Tìm n
Cho A=1/2+1/6+1/12+1/20+1/30+...+1/n. Biết A=49/50 tìm n .
Cho A=1/2+1/6+1/12+1/20+1/30+.....+1/n
Biết A=49/50
Tìm N
A= 1/2 + 1/6 + 1/12 + 1/20 .......+ 1/n
Tìm n biết A là 49/50
Cho A= 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + ....+ 1/n
Biết A = 49/50 tìm n
A= 1/2 + 1/6 +1/12+1/20+1/30+...+1/n A=49/50 Tìm n.
A= 1/2 + 1/6 +1/12+1/20+1/30+...+1/n
A=49/50
Tìm n.
Cho A = 1/2 + 1/6 + 1/12 + 1/20 +1/30 + ....... + 1/n . Biết A = 49/50 . Tìm n .
1560 | 2450 |
A = 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/n
A = 49/50
Tim n