10.
dwa minusy dają plus
a) -11 -(-5) = -11 + 5 = -6
12 + 6 + (-20)= 18 + (-20) = -2
-103 + 12 + 57 = -91 + 57 = -34
b) -3 + 5 + (-9) - 4 = 2 + (-13) = -11
-2 + 23 + (-30) = 21 + (-30) = -9
-75 - 50 + 65= -125 + 65 = -60
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10.
dwa minusy dają plus
a) -11 -(-5) = -11 + 5 = -6
12 + 6 + (-20)= 18 + (-20) = -2
-103 + 12 + 57 = -91 + 57 = -34
b) -3 + 5 + (-9) - 4 = 2 + (-13) = -11
-2 + 23 + (-30) = 21 + (-30) = -9
-75 - 50 + 65= -125 + 65 = -60