Помоги решить №248,№249,№250
249). 12/15 6/20 1.3/8 6/12
248 - 5,6,8,12,16,18,19,1/2, 1/3, 2/9, 9/10,0.4,0.7,0.01, 1.7
№250 - 1,8; 0.92; 0.8; -1; 1; -3