Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(+(-3)+(-6)-(+1)+(-4)+(-1)=-3-6-1-4-1=-15\)
2. \(-(-7)+(-2)-(+9)-(-4)+(+7)=+7-2-9+4+7=7\)
3. \(6-4+3-7+7=5\)
4. \(-2-6+8+3+7=10\)
5. \(9-9+2+3-5=0\)
6. \(-(+5)-(-3)-(+4)-(+6)-(-6)=-5+3-4-6+6=-6\)
7. \(+(-3)+(-8)+(+7)-(-6)+(+6)=-3-8+7+6+6=8\)
8. \(-6-7+4+9-1=-1\)
9. \(+(+4)-(-5)+(+4)+(-6)+(+5)=+4+5+4-6+5=12\)
10. \(-(+8)+(-9)-(+5)+(-4)-(+7)=-8-9-5-4-7=-33\)
11. \(+(+7)+(-7)+(+5)-(-1)+(+3)=+7-7+5+1+3=9\)
12. \(4-8-2+4+2=0\)