Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

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