Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+7)+(-9)=-7-9=-16\)
2. \(1-(-7)=1+7=8\)
3. \(-(-4)+(-4)=4-4=0\)
4. \(5-(-5)=5+5=10\)
5. \(-(-10)-(+5)=10-5=5\)
6. \(-12-(-3)=-12+3=-9\)
7. \(-(-3)+(-3)=3-3=0\)
8. \(-(-2)-(+1)=2-1=1\)
9. \(-(-11)+(+5)=+11+5=16\)
10. \(-(+3)-(-12)=-3+12=9\)
11. \(-(-1)-(+1)=1-1=0\)
12. \(-(+1)+(-10)=-1-10=-11\)