13.
1)4-5= -1
2)-4-7= -(4+7)= -1
3)12-(-8)=12+8=20
4)-17-(-18)= -17+18=18-17=1
5)0-(-15)=0+15=15
6)-3-(-2)= -3+2= -1
7)0-5= -5
8) -4-(-4)= -4+4=4-4=0
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13.
1)4-5= -1
2)-4-7= -(4+7)= -1
3)12-(-8)=12+8=20
4)-17-(-18)= -17+18=18-17=1
5)0-(-15)=0+15=15
6)-3-(-2)= -3+2= -1
7)0-5= -5
8) -4-(-4)= -4+4=4-4=0