Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(-4)-(+5)=4-5=-1\)
2. \(-(+5)+(-5)=-5-5=-10\)
3. \(5-(-9)=5+9=14\)
4. \(-1-(+6)=-1-6=-7\)
5. \(-(-2)-(-7)=2+7=9\)
6. \(-(-1)+(-1)=1-1=0\)
7. \(-(-10)+(+8)=+10+8=18\)
8. \(-(+5)+(-6)=-5-6=-11\)
9. \(-5-(-2)=-5+2=-3\)
10. \(1-(-9)=1+9=10\)
11. \(-(-9)+(-2)=+9-2=7\)
12. \(1-(-8)=1+8=9\)