Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+8)+(-12)=-8-12=-20\)
2. \(-3-(-2)=-3+2=-1\)
3. \(-(-7)+(-6)=7-6=1\)
4. \(-(-1)+(+4)=+1+4=5\)
5. \(-(-1)+(+2)=+1+2=3\)
6. \(7-(-9)=7+9=16\)
7. \(-2-(-7)=-2+7=5\)
8. \(-7-(-2)=-7+2=-5\)
9. \(-(+7)+(-7)=-7-7=-14\)
10. \(-(-12)+(-3)=12-3=9\)
11. \(8-(-9)=8+9=17\)
12. \(-(-4)+(-8)=4-8=-4\)