при a = 3/19, b = -3 3/7, c = 1 13/14:
4 2/9 а + 8 1/6 b + 11/25 с =
= 4 2/9 * 3/19 + 8 1/6 * (-3 3/7) + 11/25 * 1 13/14 =
= 38*9 * 3/19 - 49/6 * 24/7 + 11/25 * 27/14 =
пояснение:
38*9 * 3/19 ⇒ сокращаем 38 и 19, 9 и3,
49/6 * 24/7 ⇒ сокращаем 49 и 7, 24 и 6,
= 2/3 - 7*4 + 297/350 =
= 700/1050 - 28 + 891/1050 =
= 1591/1050 - 28 =
= 1 541/1050 - 27 1050/1050 = -26 509/1050
