n=1
thì 18 x 1 + 3 / 21 x 1 + 7 = 21 / 28 = 3 / 4
thì tìm n sao cho 18n+3 chia hết cho 21n+7 là dc rùi
tim tat ca cac so tu nhien n de phan so \(\frac{18n+3}{21n+7}\)co the rut gon duoc
tim stn n de phan so A = 8n + 193 phan 4n+3 sao cho
a) co gia tri stn
b) la phan so toi gian
c) voi gia tri nao cua n trong khoang 150 den 170 thi phan so A rut gon duoc
tim n thuoc N de n+3/2n-2 nguyen
tim n thuoc N de A= 21n + 3 / 6n + 4 rut gon duoc
Tim so tu nhien n de phan so A = 8n + 193 / 4n + 3 :
c) Voi gia tri nao cua n trong khoang tu 150 den 170 thi phan so A rut gon duoc.
tong cua tu so va mau so cua mot phan so la 4812 sau khi rut gon phan so do ta duoc phan so 5/7 hay tim phan so chua rut gon
tim so tu nhien x nho hon 63 de co the rut gon duoc phan so 63/x+1
Tim n thuoc Z de phan so sau rut gon duoc:
4n+5/5n+4
Nho ghi cach lam nua nhe
Cho phan so a/35
a, tim so nguyen to a de a/35 rut gon duoc
b, Tim cac so a biet phan so do la phan so toi gian nho nhat hon 1
