а) -5/8 + 4/15 = (-75 + 32) / 120 = -43 / 120 = -43 / 120б) 5,7 + (-7) + 8/15 + (-1) + 1/12 = 5.7 - 7 + 1/15 - 1/12 = -1.3 + (12 - 15) / 60 = -1.3 - 3 / 60 = -1.35
6.15 + (-1) + 4/7 + (-4.7) + (-2.15) + 4.7 = 6.15 - 1 + 4/7 - 4.7 - 2.15 + 4.7= 6.15 - 1 - 4.7 - 2.15 + 4.7 + 4/7= 0.3 - 2.15 + 4/7= -1.85 + 4/7= (-130 + 28) / 70= -102 / 70= -51 / 35
а) -5/8 + 4/15 = (-75 + 32) / 120 = -43 / 120 = -43 / 120
б) 5,7 + (-7) + 8/15 + (-1) + 1/12 = 5.7 - 7 + 1/15 - 1/12 = -1.3 + (12 - 15) / 60 = -1.3 - 3 / 60 = -1.35
6.15 + (-1) + 4/7 + (-4.7) + (-2.15) + 4.7 = 6.15 - 1 + 4/7 - 4.7 - 2.15 + 4.7
= 6.15 - 1 - 4.7 - 2.15 + 4.7 + 4/7
= 0.3 - 2.15 + 4/7
= -1.85 + 4/7
= (-130 + 28) / 70
= -102 / 70
= -51 / 35