Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

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