Optellen en aftrekken (reeks 3)

Hoofdmenu Eentje per keer  🖨

Reken uit

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

---

Reken uit

Verbetersleutel

1. \(-(+5)-(-7)+(+7)+(+8)+(-9)=-5+7+7+8-9=8\)
2. \(-(+2)+(-4)-(+7)+(-6)-(-5)=-2-4-7-6+5=-14\)
3. \(+(-5)-(-4)+(+9)+(-4)-(+9)=-5+4+9-4-9=-5\)
4. \(-6-4+5-8+7=-6\)
5. \(-2+2+6+3-6=3\)
6. \(+(-5)+(-2)-(+8)+(-2)+(-3)=-5-2-8-2-3=-20\)
7. \(-(-4)-(-8)+(-1)-(-5)+(+7)=+4+8-1+5+7=23\)
8. \(-(-7)-(-4)+(+6)+(+7)+(+8)=+7+4+6+7+8=32\)
9. \(-(+9)-(-6)-(+9)-(-4)+(-4)=-9+6-9+4-4=-12\)
10. \(+(-6)-(-5)-(+6)+(-3)+(+3)=-6+5-6-3+3=-7\)
11. \(-(-5)-(-3)-(+7)+(-3)-(-3)=+5+3-7-3+3=1\)
12. \(-2-3-1+1-1=-6\)