1 .CMR
a) 1/5+1/14+1/28+1/44+1/61+1/85+1/97<1/2
b) 5/11+5/12+5/13+5/14<2
Giúp Mình Nha
Cho A=1/5+1/14+1/28+1/44+1/61+1/85+1/97. CMR A<1/2. Chia 3 nhóm: nhóm 1 số hạng đầu, 2 nhóm sau đều nhau
CM: 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
chung 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
chung minh rang
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 minh: 1/5 + 1/14+1/28 +1/44 + 1/61+1/85+1/97 <1/2
giúp mình nha!!!! cần gấp
