Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(2-6+5+9-8=2\)
2. \(+(-8)-(-8)-(+3)+(+7)+(-4)=-8+8-3+7-4=0\)
3. \(-(-7)-(-4)-(-2)-(+2)+(+4)=+7+4+2-2+4=15\)
4. \(9+1+5-3-3=9\)
5. \(-(+5)-(-2)-(+2)-(-6)+(-7)=-5+2-2+6-7=-6\)
6. \(8-1+1+5-5=8\)
7. \(+(-4)-(-5)+(+1)-(-3)-(-9)=-4+5+1+3+9=14\)
8. \(6+1+6-9+7=11\)
9. \(-(-1)+(-4)+(+6)-(-5)-(+7)=+1-4+6+5-7=1\)
10. \(2-3+4-9-4=-10\)
11. \(+(-9)+(-3)+(-1)+(-1)-(+6)=-9-3-1-1-6=-20\)
12. \(+(+9)+(+2)-(-1)-(-2)+(-4)=+9+2+1+2-4=10\)