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12 - 5 =
7
b). - 10 + 2 =
- 10 + 2 =
- 8
c). - 21 + (- 11) =
- 21 -11 =
- 32
d). - 48 + (- 47) =
- 48 - 47 =
- 95
e). - 39 + 51 =
- 39 + 51 =
12
f). - 15 - 19 =
- 15 - 19 =
- 34
g). 45 - ( - 90) =
45 + 90 =
135
h). 12 - ( - 300) =
12 + 300 =
312
i). - 51 + 16 =
- 51 + 16 =
- 35
j). 450 - ( - 30) =
450 + 30 =
480
b)-8
c)-32
d)-95
e)12
f)-34
g)135
h)312
i)-35
j)480