Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-8-(-8)=-8+8=0\)
2. \(-(-5)-(-4)=5+4=9\)
3. \(-(-8)+(+7)=+8+7=15\)
4. \(-3-(+1)=-3-1=-4\)
5. \(-(+7)-(-8)=-7+8=1\)
6. \(-4-(-2)=-4+2=-2\)
7. \(-(-7)-(+1)=7-1=6\)
8. \(-(+5)+(-8)=-5-8=-13\)
9. \(-10-(-7)=-10+7=-3\)
10. \(-(+6)+(-7)=-6-7=-13\)
11. \(-4-(+1)=-4-1=-5\)
12. \(-(-7)-(-7)=7+7=14\)