Question

chung minh rang:

1/5+1/13+1/25+1/41+1/61+1/85+1/113<1/2

 

Answer 1

1/5+1/13+1/25+1/41+1/61+1/85+1/113

=1/5+(1/13+1/25+1/41)+(1/85+1/61+1/113)<15+1/12+1/12+1/12+1/60+1/60+1/60

..............................................................<1/5+1/4+1/20

..............................................................<4/20+5/20+1/20

..............................................................<1/2

Answer 2

Cảm ơn nhiều (đúng lúc đang cần,hì ,hì)

Answer 3

dung luc can

Answer 4

Giup mik vs mik cung dang mac cau nay

Answer 5

.................... là sao lo hiêu