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

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Verbetersleutel

1. \(-(+5)-(-8)=-5+8=3\)
2. \(1-(-9)=1+9=10\)
3. \(-(+2)-(-8)=-2+8=6\)
4. \(7-(-10)=7+10=17\)
5. \(-(+5)+(-10)=-5-10=-15\)
6. \(-(+3)+(-8)=-3-8=-11\)
7. \(-(-11)-(+3)=11-3=8\)
8. \(-(-12)+(-2)=12-2=10\)
9. \(-(-7)-(-8)=7+8=15\)
10. \(-(+3)+(-3)=-3-3=-6\)
11. \(-7-(-4)=-7+4=-3\)
12. \(-(-5)+(-8)=+5-8=-3\)