Chung minh rang tong cua mot phan so duong voi so nghich daocua no thi khong nho hon 2
tim 2 phan so co tu = 1, cac mau duong, biet rang tong cua 2 phan so ay cong voi tich cua chung = 1/2
cho 2 phan so co tong bang 2015 lan tich cua chung
tinh tong cac phan so nghich dao cua chung
chung to rang tong cua 3 phan so sau nho hon 2 :A=10/27 ,9/16,11/24
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
Khong tinh tong cua ba phan so sau, hay chung to rang tong do nho hon 2:
A= 11/ 29+ 9/ 17 + 10/ 19
tim 2 so nguyen duong sao cho tong nghich dao cua chung bang 2
cho 12 số tu nhien lien tiep . chung minh rang ton tai mot so trong cac do nho hon nua tong cac uoc cua no .
tim so co 3 chu so biet rang nghich dao cua tong 3 chu so do bang 1 phan 1000 so da cho