1/61+1/62+1/63+...+1/90 và 1/3
Những câu hỏi liên quan
CMR : 1/3+1/5+1/13+1/14+1/15+1/61+1/62+1/63<5/6
CMR : 1/3+1/5+1/13+1/14+1/15+1/61+1/62+1/63 < 5/6
Chứng minh:S=1/3+1/13+1/14+1/15+1/61+1/62+1/63+1/64+1/65+1/66<3/4
s= 1/5+1/13+1/14+1/15+1/61+1/62+1/63.CMR:3/7<S<1/2
Chứng minh: A= 1/3+1/13+1/14+1/15+1/61+1/62+1/63+1/64+1/65+1/66<3/4
Vì \(\frac{1}{13}+\frac{1}{14}+\frac{1}{15}
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CHO 1/5+1/13+1/14+1/15+1/61+1/62+1/63
cHỨNG minh 3/7<S<1/2
CMR: 1/5 + 1/13 +1/14 +1/15 +1/61 +1/62 + 1/63 < 1/2
chứng minh rằng s=1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
Cho B=1/61+1/62+1/63+.....+1/80.Chứng minh B<1/2
vi 1/62>1/80 ;1/62>1/80:...:1/80=0/80
suy ra 1/61+1/62+1/63+...+1/80>1/80+1/80+1/80+...+1/80
moi ve co 20 so hang
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