Ta có : S = 1/5 + ( 1/13 + 1/14 + 1/15 ) + ( 1/61 + 1/62 + 1/63 ) < 1/5 + 1/12 x 3 + 1/60 x 3
S < 1/5 + 1/4 + 1/20 = 10/20 = 1/2
S < 1/2
vừa nãy ấn nhầm k mk nha
chứng minh rằng s=1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
chứng minh 1/5+1/13+1/14+1/15+1/61+1/62+1/63 < 1/2
Chứng tỏ rằng : 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
a=1/5+1/13+1/14+1/15+1/61+1/62+1/63<1/2
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
ai nhanh nhất mình sẽ tick cho đấy