Tìm một phân số a/b thuoc N co gia tri bang 15/35 biet UCLN {a.b} . BCNN{a.b} bang 189
Tim phan so co gia tri bang gia tri phan so -35/14 dong thoi co tong cua tu so va mau so la75
Tim phan so co gia tri bang phan so -35/14, dong thoi co tong cua tu so va mau so la 75
Chung to rang voi gia tri tim duoc cua n o cau a thi p bang phan so p= n+4^2n-1 (n khong bang -2)hoac bang phan so n mu 3^ n+2 ( n khong bang -2)
Tim mot phan so co mau so bang 11, biet rang khi lay tu so cua phan so do tru di 18 va mau so cua phan so do nhan voi 7 thi duoc phan so moi co gia tri bang phan so can tim.Phan so do la?
cho phan so n+8/n-7 voi n thuoc N , n>7
A,tim n de phan so co gia tri guyen
B,tim n de phan so toi gian
cho phan so A= (6n- 1)/3n+2
tim n thuocZ de a co gia tri nguyen
tim n thuoc Z de a co gia tri lon nhat
Mot phan so co mau bang 7 biet khi cong tu voi 16 nhan mau voi 5thi gia tri cua phan so khong doi .Tim phan so do
1)cho phan so A=\(\frac{n+1}{n-2}\)
a tim n thuoc Z de A co gia tri nguyen
b tim n thuoc Z de A co gia tri lon nhat