Question

Salut ma ajutati ? va rog: aratati ca 1+1 supra 2 + 1 supra 3 + 1 supra 4 +...+1 supra 1023 > 5,5

Answer 1

1=1`
1/2=1/2
1/3+1/4+1/5>3*1/5=3/5>2,5/5=1/2
1/6+1/7+1/8+1/9+1/10>5/10=1/2
1/11+1/12+............+1/20>10/20=1/2
1/21+1/22+............+1/40>20/40=1/2
1/41+1/42+.............+1/80>40/80=1/2
1/81+1/82.......................+1/160>80/160=1/2
1/161+.....................+1/320>160/320=1/2
1/321+......................+1/640>320/640=1/2
1/641+........................+1/1023>0
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