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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Các câu hỏi tương tự
Cho b=1/61+1/62+1/63+1/64+...+1/119+1/120. Chứng minh rằng 7/12<b<1
chứng minh rằng s=1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
Chứng minh :
a, S= 1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
b, P = 1/2+1/2^2+...+1/2^20< 1
CHO 1/5+1/13+1/14+1/15+1/61+1/62+1/63
cHỨNG minh 3/7<S<1/2
chứng minh 1/5+1/13+1/14+1/15+1/61+1/62+1/63 < 1/2
Chứng minh S = 1/5 +1/13+ /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
Chứng minh rằng ; S = 1/5+1/13+1/14+1/15+1/61+1/62+1/63 < 1/2
ai nhanh nhất mình sẽ tick cho đấy
Chứng minh
a=1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2