Optellen en aftrekken (reeks 3)

Hoofdmenu Eentje per keer  🖨

Reken uit

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

---

Reken uit

Verbetersleutel

1. \(-(-6)-(-1)+(+5)+(+2)+(-6)=+6+1+5+2-6=8\)
2. \(-(-9)+(+1)+(+1)-(-3)+(-7)=+9+1+1+3-7=7\)
3. \(+(+7)-(-9)+(+3)+(-1)-(+2)=+7+9+3-1-2=16\)
4. \(+(+7)-(-5)-(+6)-(+8)+(+2)=+7+5-6-8+2=0\)
5. \(-7-7+9-7+8=-4\)
6. \(+(+8)-(-9)-(+9)-(-6)-(+7)=+8+9-9+6-7=7\)
7. \(7-8+7+8-3=11\)
8. \(2+2+8+9+2=23\)
9. \(-4-7+4-4-5=-16\)
10. \(+(-2)-(-9)-(+8)-(+7)+(-8)=-2+9-8-7-8=-16\)
11. \(-(-8)-(-6)-(+9)-(+6)-(-8)=+8+6-9-6+8=7\)
12. \(-(-3)+(-3)-(+9)-(-2)-(+6)=+3-3-9+2-6=-13\)