Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

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