odejmowanie liczb całkowitych
oblicz :
30-12=... 30- (-12)=... 23 - 18=...
-12 - (-30)=... 18-23=... -23 + (-18)=...
-30 - 12=... 12 - (-30)=... -18- 23=...
-12 - 30=... 12 - 30=.. -30 - (-12)=...
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30-12=18
30-(-12)=30+12=42
23-18=5
-12-(-30)= -12+30=18
18-23=-5
-23+(-18)= -41
-30-12= -42
12-(-30)=12+30 =42
-18-23= -41
-12 - 30 = -42
12-30= -18
-30 - (-12)= -18