Optellen en aftrekken (reeks 2)

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

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Verbetersleutel

1. \(7-(-9)=7+9=16\)
2. \(-(-7)+(+5)=+7+5=12\)
3. \(-(+1)-(-8)=-1+8=7\)
4. \(-(-2)-(+7)=2-7=-5\)
5. \(-(+2)+(-5)=-2-5=-7\)
6. \(-6-(-3)=-6+3=-3\)
7. \(-(+2)+(-3)=-2-3=-5\)
8. \(-(-3)+(-5)=3-5=-2\)
9. \(-(+5)+(-10)=-5-10=-15\)
10. \(-12-(+7)=-12-7=-19\)
11. \(-(+5)+(-6)=-5-6=-11\)
12. \(-(-9)+(+8)=9+8=17\)