Khong tinh tong cua ba phan so sau, hay chung to rang tong do nho hon 2:

A= 11/ 29+ 9/ 17 + 10/ 19

Giup minh nhe

Khong tinh tong cua 3 phan so sau, hay chung to rang tong do nho hon 2:

A = 11/29 + 9/17 + 10/19

chung to rang tong cua 3 phan so sau nho hon 2 :A=10/27 ,9/16,11/24

chung to rang tong B sau lon hon 1/2 B=1/12+1/13+1/14+1/15+1/16+1/17+1/18+1/19+1/20+1/21+1/22

chung to rang tong cua 100 so hang dau tien cua day nho hon 1/4

 1/5;1/45;1/117;1/221;1/357;...

Chung minh rang tong cua mot phan so duong voi so nghich daocua no thi khong nho hon 2

Tim phan so co tong bang 4 biet rang phan so do lon hon 13/17 va nho hon 13/15 {{ai giai dc to cho 1 tick. the do}

Chung minh rang

1 be hon 1/5+1/6+.....+1/16+1/17 be hon 2

chung minh rang trong mot tam giac moi duong trung nho hon tong cua hai trung tuyen kia