Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-(-4)+(-9)+(+4)+(+2)-(+5)=+4-9+4+2-5=-4\)
2. \(-2+2+3-9-8=-14\)
3. \(-(-9)-(-5)-(+2)-(-7)+(-7)=+9+5-2+7-7=12\)
4. \(1-3+7-6-9=-10\)
5. \(7-2+3-1+8=15\)
6. \(+(+3)-(-6)+(+5)-(+9)-(+8)=+3+6+5-9-8=-3\)
7. \(-(-2)+(-5)-(+1)+(+6)+(-5)=+2-5-1+6-5=-3\)
8. \(-6-5+9-8+7=-3\)
9. \(-(+7)-(-5)+(+6)+(-2)+(-7)=-7+5+6-2-7=-5\)
10. \(-(+9)+(-8)-(+5)-(-2)+(-9)=-9-8-5+2-9=-29\)
11. \(+(-6)+(-6)+(+3)+(+2)-(-4)=-6-6+3+2+4=-3\)
12. \(-9-8-1-1+1=-18\)