0,75a-0,25b+2,5c при a=1/3 b=2/3 c=1/6

0,75 = 3/4         0,25 = 1/4         2,5 = 5/2--------------------------------------------------------0,75a - 0,25b + 2,5c = 3/4a - 1/4b + 5/2c при  а = 1/3     b = 2/3     c = 1/63/4 * 1/3 - 1/4 * 2/3 + 5/2 * 1/6 = 3/12 - 1/12 + 5/12 = 7/12Ответ: 7/12.