Đặt 1/5 + 1/14 + 1/28 + 1/44 + 1/61 + 1/85 + 1/97 = A
A = 1/5 + (1/14 + 1/28 + 1/44) + (1/61 + 1/85 + 1/97)
A < 1/5 + (1/14 * 3) + (1/61 * 3)
A < 1/5 + 3/14 + 3/61
A < 1/5 + 3/12 + 3/60
A < 1/2 (đpcm)
chung minh rang
1/5+1/14+1/28+1/44+1/61+1/85+1/97<1/2
chứng minh: 1/5 + 1/14+1/28 +1/44 + 1/61+1/85+1/97 <1/2
chứng minh
1/5+1/14+1/28+1/44+1/61+1/85+1/97<1/2
chứng minh: 1/5 + 1/14+1/28 +1/44 + 1/61+1/85+1/97 <1/2
giúp mình nha!!!! cần gấp
CM: 1/5+1/14+1/28+1/44+1/61+1/85+1/97<1/2
CMR:1/5+1/14+1/28+1/44+1/61+1/85+1/97<1/2
chứng tỏ rằng
A= 1/5 + 1/14 + 1/28 + 1/44 + 1/61 + 1/85 + 1/97 < 1/2
Chứng tỏ B=1/5+1/14+1/28+1/44+1/61+1/85+1/97<1/2
Giúp mình với
Chứng minh rằng: \(\frac{1}{5}+\frac{1}{14}+\frac{1}{28}+\frac{1}{44}+\frac{1}{61}+\frac{1}{85}+\frac{1}{97}<\frac{1}{2}\)
