а) 7.5 - (-3.7) = 7.5 + 3.7 = 11.2
б) -2.3 - 6.2 = -8.5
в) 7 1/4 - (-8 2/9) = 7 + 1/4 + 8 + 2/9 = 15 9/36 + 36 + 8/36 = 14 17/18
г) -8 5/12 - (-7 13/15) = -8 - 5/12 + 7 13/15 = -8 - 5/12 + 7 + 13/15 = -1 35/60 - 48/60 + 49/60 = -1 64/60 = -2 4/5
а) 7.5 - (-3.7) = 7.5 + 3.7 = 11.2
б) -2.3 - 6.2 = -8.5
в) 7 1/4 - (-8 2/9) = 7 + 1/4 + 8 + 2/9 = 15 9/36 + 36 + 8/36 = 14 17/18
г) -8 5/12 - (-7 13/15) = -8 - 5/12 + 7 13/15 = -8 - 5/12 + 7 + 13/15 = -1 35/60 - 48/60 + 49/60 = -1 64/60 = -2 4/5