Oblicz w pamięci :
a) -12 + (-11) = ......
-50 + 25 = ......
-101+ (-120) = ......
b) -7 + 42 = .....
-101 + 84 = .......
-106 + 120 = ......
c) -16 + 3 = .........
99 + (-19) = ........
-27 + 31 = .............
d) -8 1/2 + 6 = .....
-3/4 + (-3/4) = ....
- 3 5/7 + 3/7 = ....
e) -13 + 5,6 = ......
-6,2 + (-2,6) = .......
- 0,75 + (-1,3) =......
f) -2 + 1/2 = ....
-0,5 + 1 1/2 = ......
0,75 + (-3/4) = .......
plis
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a) -12 + (-11) = -23
-50 + 25 =-25
-101+ (-120) =-221
b) -7 + 42 = 35
-101 + 84 = -17
106 + 120 = 226
c) -16 + 3 = -13
99 + (-19) = 80
-27 + 31 = 4
d) -8 1/2 + 6 = -2 1/2
-3/4 + (-3/4) = -1 1/2
- 3 5/7 + 3/7 = -3 2/7
e) -13 + 5,6 =-7,4
-6,2 + (-2,6) = -8,8
- 0,75 + (-1,3) =-2,05
f) -2 + 1/2 = -1,5
-0,5 + 1 1/2 = 1
0,75 + (-3/4) = 0