Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(-(-1)+(-7)+(+5)+(+3)-(+7)=+1-7+5+3-7=-5\)
2. \(-6-7+7-1+3=-4\)
3. \(+(+2)-(-7)+(+2)-(+4)+(-8)=+2+7+2-4-8=-1\)
4. \(+(-5)-(-4)-(+9)-(+1)+(-7)=-5+4-9-1-7=-18\)
5. \(9-1-2-1-9=-4\)
6. \(+(-4)-(-6)+(+8)+(-5)+(-5)=-4+6+8-5-5=0\)
7. \(7-4+9+9-9=12\)
8. \(-(+2)+(-4)-(-2)-(-5)+(+2)=-2-4+2+5+2=3\)
9. \(-(+4)-(-7)-(+5)-(+1)-(+5)=-4+7-5-1-5=-8\)
10. \(7-2+7+9-1=20\)
11. \(-8-8-2-3+8=-13\)
12. \(+(+5)+(-6)+(+6)+(-9)-(-8)=+5-6+6-9+8=4\)