Optellen en aftrekken (reeks 3)

Hoofdmenu Eentje per keer  🖨

Reken uit

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

---

Reken uit

Verbetersleutel

1. \(-(-7)-(-9)+(+1)-(+3)+(+1)=+7+9+1-3+1=15\)
2. \(-(+7)-(-5)+(+4)-(-2)+(-4)=-7+5+4+2-4=0\)
3. \(-(-3)+(-4)+(+2)+(-9)-(+9)=+3-4+2-9-9=-17\)
4. \(+(+5)+(-8)+(+6)+(-2)-(+5)=+5-8+6-2-5=-4\)
5. \(+(+1)-(-9)-(+6)-(-7)-(-3)=+1+9-6+7+3=14\)
6. \(6-9+6-1+6=8\)
7. \(-(-4)-(-2)+(+8)+(+1)+(+1)=+4+2+8+1+1=16\)
8. \(-8-9+1+3+9=-4\)
9. \(9-5+8-5+3=10\)
10. \(-(+7)-(-4)+(+8)-(-3)-(-1)=-7+4+8+3+1=9\)
11. \(6-6+3-6-7=-10\)
12. \(-(-2)-(-2)+(-1)+(-9)-(+7)=+2+2-1-9-7=-13\)