Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-7+1+7-3-3=-5\)
2. \(1+2+3-2-7=-3\)
3. \(-5-8+6-3+2=-8\)
4. \(-(-3)-(-5)+(+6)-(-4)+(-7)=+3+5+6+4-7=11\)
5. \(-(-2)-(-5)-(+1)-(+8)+(+6)=+2+5-1-8+6=4\)
6. \(+(-9)+(-9)-(-2)-(+7)-(+2)=-9-9+2-7-2=-25\)
7. \(7-6+1+8-8=2\)
8. \(-6-6+6-4+7=-3\)
9. \(-4-4+2+6+4=4\)
10. \(-(-9)-(-7)-(+7)-(-7)-(+9)=+9+7-7+7-9=7\)
11. \(1-6+6-2+7=6\)
12. \(+(-2)+(-6)+(+1)-(-7)+(-3)=-2-6+1+7-3=-3\)