68/102
136/204
238/357
tích nha 
nguyen vo thuy tram
Ba phân số đó là \(\frac{2}{3};\frac{4}{6};\frac{8}{12}\)
tim 3 phan so:
a)bang phan so 7/9
b)bang phan so 23/37
Cho cac phan so 26/39 30/42 38/57 51/85 39/65 20/28; tim cac cap phan so bang nhau
tim mot phan so bang phan so 9/10 neu tu so cua phan so tru di 15 va giu nguyen mau so thi ta duoc phan so moi bang phan so 3/4
Cho Phan so 34/25. Hay tim so tu nhien a sao cho khi ta lay tu so tru đi a va giữ nguyen mau so thi duoc Phan so moi bang 4/5
tim cac phan so co tu so be hon 30 va: bang phan so 5/3 va bang phan so 4/7 dang cAN GAP
tim mot phan so biet tong cua tu so va mau so cua phan so do bang 162 va biet phan so do co gia tri bang 4/5
tim phan so do
tim 3 phan so bang phan so 57/80
cho phan so 27/34. hay tim so tu nhien m sao cho khi them m vao ca tu va mau cua phan so da cho thi duoc phan so moi bang 9/10 ai tra loi nhanh mik tk cho
Cho phan so 3 phan 7.Neu cong them vao tu so va mau so do voi cung mot so tu nhien thi duoc mot phan so moi bang phan so 2 phan 3.Tim hai phan so do.
