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

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Verbetersleutel

1. \(-(-7)-(+4)=7-4=3\)
2. \(-(-7)-(-7)=7+7=14\)
3. \(-(+5)+(-8)=-5-8=-13\)
4. \(-(+3)+(-10)=-3-10=-13\)
5. \(-(-5)-(+2)=5-2=3\)
6. \(-(-10)-(-5)=10+5=15\)
7. \(-(+3)+(-7)=-3-7=-10\)
8. \(2-(-5)=2+5=7\)
9. \(-(+3)-(-9)=-3+9=6\)
10. \(7-(-9)=7+9=16\)
11. \(2-(-4)=2+4=6\)
12. \(-7-(+5)=-7-5=-12\)