3\8у+у-1\4у при у= 2целых2\3 4\9 13\15m-3\4m+1\12m при м=2целых 1\2 и 6целых 1\4 1\3х+3\4х-4\9х при х 1 целая 13\23 9\46

1. 3/8у + у - 1/4у = у * (3/8+8/8-2/8) = у*9/8 = 1 1/8 * у, При у = 2 2/3: 1 1/8 * 2 2/3 = 9/8*8/3 = 9/3 = 3, При у = 4/9: 1 1/8 * 4/9 = 9/8 * 4/9 = 4/8 = 1/2 (или 0,5), 2. 13/15m - 3/4m + 1/12m = m * (13/15-3/4+1/12) = m * (52/60-45/60+5/60) = m * 12/60 = 1/5*m. При m = 2 1/2: 1/5*2 1/2 = 1/5 * 5/2 = 1/2 (0,5), при m = 6 1/4: 1/5 * 6 1/4 = 1/5 * 25/4 = 5/4 = 1 1/4 (1,25), 3. 1/3х + 3/4х - 4/9х = х * (1/3 + 3/4 - 4/9) = х * (12/36+27/36-16/36) = 23/36 * х, При х = 1 13/23: 23/36 * 1 13/23 = 23/36 * 36/23 = 1, При х = 9/46: 23/36 * 9/46 = 1/8