Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. \(6-5+7-3-9=-4\)
2. \(-(-8)+(-6)-(+6)+(+3)-(-8)=+8-6-6+3+8=7\)
3. \(-(-1)+(-3)-(+1)-(-4)+(+8)=+1-3-1+4+8=9\)
4. \(-(-8)+(-5)+(+2)-(+4)+(-9)=+8-5+2-4-9=-8\)
5. \(-(+4)+(-2)-(+9)+(-7)+(+1)=-4-2-9-7+1=-21\)
6. \(-(-9)-(-4)-(+4)+(-9)-(+3)=+9+4-4-9-3=-3\)
7. \(+(-2)+(+2)+(+1)-(-7)-(-9)=-2+2+1+7+9=17\)
8. \(+(-9)+(-3)-(+6)+(+4)-(+5)=-9-3-6+4-5=-19\)
9. \(-7-2+3-3-1=-10\)
10. \(-8-2+9+4-1=2\)
11. \(-(+2)+(-5)+(+8)-(+1)+(-1)=-2-5+8-1-1=-1\)
12. \(+(-1)-(-2)+(+3)-(+1)-(-9)=-1+2+3-1+9=12\)