Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+7)-(-10)=-7+10=3\)
2. \(2-(-3)=2+3=5\)
3. \(-(-3)+(-7)=3-7=-4\)
4. \(4-(-7)=4+7=11\)
5. \(-(-10)+(-5)=10-5=5\)
6. \(-(-7)+(+1)=+7+1=8\)
7. \(-(-4)+(+6)=4+6=10\)
8. \(-(+4)-(-6)=-4+6=2\)
9. \(-12-(+8)=-12-8=-20\)
10. \(-(-9)-(-3)=9+3=12\)
11. \(-(-4)-(+8)=4-8=-4\)
12. \(-(-3)-(+2)=3-2=1\)