a.tim phan so co mau la 20 sao cho phan so do lon hon 4/13 va nho hon 5/13
b.tim phan so co mau bang 20 sao ho phanso do lon hon 5/7 va nho hon 5/6
tim phan so co tong va tu so va mau so bang 25 , mau so lon hon 7 don vi
Tim phan so co tong bang 4 biet rang phan so do lon hon 13/17 va nho hon 13/15 {{ai giai dc to cho 1 tick. the do}
tim tong cac phan so lon hon -1 phan 7 nho hon -1 phan 8 va co tu la-3
tinh tong cac phan so toi gian lon hon 3 nhung nho hon 4 co mau so bang 7 ket qua la..............
tim 2 phan so co mau bang 21 ,biet rang no lon hon -5/6 va nho hon -5/7
tim tat ca cac phan so co mau so la 12 lon hon -2/3 va nho hon -1/4.
tim 2 phan so co mau bang 21 biet rang no lon hon -5/6 va nho hon -5/7
Viet phan so \(\frac{2}{3}\) thanh tich cua hai phan so co mau so bang nhau va lon hon 4 va nho hon 8, co tu so nho hon 8. Ket qua
