Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

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