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1. \(-(-2)+(-7)=\)
2. \(-7-(-7)=\)
3. \(-(-7)+(-5)=\)
4. \(-9-(+3)=\)
5. \(-7-(-1)=\)
6. \(-(+8)+(-12)=\)
7. \(-(-2)+(+2)=\)
8. \(-(+5)+(-5)=\)
9. \(-(+3)-(-10)=\)
10. \(-(-2)-(+5)=\)
11. \(-(-6)+(-3)=\)
12. \(-(-12)-(+5)=\)

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Verbetersleutel

1. \(-(-2)+(-7)=2-7=-5\)
2. \(-7-(-7)=-7+7=0\)
3. \(-(-7)+(-5)=7-5=2\)
4. \(-9-(+3)=-9-3=-12\)
5. \(-7-(-1)=-7+1=-6\)
6. \(-(+8)+(-12)=-8-12=-20\)
7. \(-(-2)+(+2)=2+2=4\)
8. \(-(+5)+(-5)=-5-5=-10\)
9. \(-(+3)-(-10)=-3+10=7\)
10. \(-(-2)-(+5)=2-5=-3\)
11. \(-(-6)+(-3)=+6-3=3\)
12. \(-(-12)-(+5)=12-5=7\)