Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(-7)+(+8)=7+8=15\)
2. \(-(-4)-(-7)=4+7=11\)
3. \(-(+3)-(-7)=-3+7=4\)
4. \(-(+5)+(-8)=-5-8=-13\)
5. \(-(-1)+(-7)=1-7=-6\)
6. \(-2-(-5)=-2+5=3\)
7. \(-(-4)-(+5)=4-5=-1\)
8. \(2-(-12)=2+12=14\)
9. \(-(+2)+(-6)=-2-6=-8\)
10. \(-(-3)+(-2)=3-2=1\)
11. \(-(-4)+(-3)=4-3=1\)
12. \(-(-5)-(-2)=5+2=7\)