Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(-(+4)-(-4)=-4+4=0\)
2. \(-(+7)+(-11)=-7-11=-18\)
3. \(-6-(+4)=-6-4=-10\)
4. \(-(-11)+(-6)=+11-6=5\)
5. \(-(-6)+(+1)=+6+1=7\)
6. \(-(-1)-(+7)=1-7=-6\)
7. \(-(+4)-(-7)=-4+7=3\)
8. \(-(+3)-(-7)=-3+7=4\)
9. \(-(+6)-(-10)=-6+10=4\)
10. \(-8-(-2)=-8+2=-6\)
11. \(7-(-10)=7+10=17\)
12. \(-(+5)+(-9)=-5-9=-14\)