viet cac phan so lan luot bang 7 phan 9 va 5 phan 12 va co mau so chung la 36

viet cac phan so lan luot bang 7/9 , 5/12 va co mau so chung la 36

\(\text{viet cac phan so lan luot bang 5/7; 4 va co mau so chung bang 7}\)

tim cac so nguyen a nho nhat sao cho khi nhan a lan luot voi cac phan so 7/12 ,8/15 ,3/10 deu cho ra ket qua la so nguyen 

giup minh voi

1, Quy dong mau so cac phan so 5/12,2/3 , 3/4

2,viet cac phan so lan luot bang 5/12, 7/18 va co mau so chung la 36

                  ai lam dung truoc minh tick cho

viet 5  phan so co tu so lan luot la 7, 9, 10, 12, 15?

tim phan so co gia tri nho nhat ma tu va mau la cac so tu nhien sao cho khi nhan phan so nay lan luot voi cac phan so 2\3,4\5,6/7 thi moi tich tim duoc deu la cac so tu nhien

tim 1 phan so neu tu so tang 6 lan dong thoi mau so tang len 2 lan thi gia tri phan so bang 12/11

viet cac phan so lan luot bang 13 phan 36 va 17 phan 24 co mau so chung la 72