Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-11-(+7)=-11-7=-18\)
2. \(-3-(+3)=-3-3=-6\)
3. \(-(-1)+(-3)=1-3=-2\)
4. \(-(-1)-(-2)=1+2=3\)
5. \(-(-6)+(+8)=6+8=14\)
6. \(-(+2)+(-6)=-2-6=-8\)
7. \(-(+1)-(-3)=-1+3=2\)
8. \(-(+6)+(-12)=-6-12=-18\)
9. \(-(+3)+(-6)=-3-6=-9\)
10. \(-(+4)+(-11)=-4-11=-15\)
11. \(-(-10)-(-7)=10+7=17\)
12. \(-(+8)-(-9)=-8+9=1\)