Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(-2)+(+8)=2+8=10\)
2. \(-(+3)+(-7)=-3-7=-10\)
3. \(-(-10)-(-1)=10+1=11\)
4. \(-(-2)+(-1)=+2-1=1\)
5. \(2-(-2)=2+2=4\)
6. \(-2-(-7)=-2+7=5\)
7. \(6-(-11)=6+11=17\)
8. \(-(+2)+(-5)=-2-5=-7\)
9. \(-(-7)-(-8)=7+8=15\)
10. \(-(-12)+(-1)=+12-1=11\)
11. \(-(+7)+(-9)=-7-9=-16\)
12. \(-(+6)+(-12)=-6-12=-18\)