Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(3-6+2-5-5=-11\)
2. \(-(+3)-(-7)-(+2)-(-2)-(-3)=-3+7-2+2+3=7\)
3. \(4-7+1-3-5=-10\)
4. \(8-9+3+5+6=13\)
5. \(-(-3)-(-1)+(+6)-(+3)+(+3)=+3+1+6-3+3=10\)
6. \(3-5+2+2-5=-3\)
7. \(3+2+1+2-8=0\)
8. \(5-3-2+8-8=0\)
9. \(3-2-2+1+6=6\)
10. \(-(-7)+(+2)-(+2)-(-1)+(+9)=+7+2-2+1+9=17\)
11. \(-8-5-1+4-5=-15\)
12. \(+(-4)+(-3)-(+9)+(+6)+(-2)=-4-3-9+6-2=-12\)