Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-6-6+8-8-7=-19\)
2. \(-9-6-1-3+9=-10\)
3. \(7-5-1+4-2=3\)
4. \(-(+8)-(-6)-(+8)-(-6)+(+1)=-8+6-8+6+1=-3\)
5. \(5+2+3-9+6=7\)
6. \(-(+4)+(+1)-(+2)-(-9)+(-1)=-4+1-2+9-1=3\)
7. \(-(+5)-(-2)+(+3)+(-9)-(-1)=-5+2+3-9+1=-8\)
8. \(6+2+7-3-4=8\)
9. \(5-1+5+2-9=2\)
10. \(-6-2-1+2+8=1\)
11. \(1-4+8+5+7=17\)
12. \(-2-8+4-1+5=-2\)