(+11) + 17 =
11 + 17 =
28
б)
25 + (– 30) = 25 – 30 =
– 5
в) (– 37) + (– 63) =
– 37 – 63 =
– 100
г) (– 52) + (+32) =
– 52 + 32 =
– 20
д) (– 26) + (– 12) =
– 26 – 12 =
– 38
е) (– 34) + (– 21) =
– 34 – 21 =
– 55