Optellen en aftrekken (reeks 3)

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

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Verbetersleutel

1. $$7-7+8-5+2=5$$
2. $$4-7+2+5-5=-1$$
3. $$-3-3+7+1+6=8$$
4. $$+(+4)-(-9)-(-1)-(+1)-(+7)=+4+9+1-1-7=6$$
5. $$-2+1-1-1-4=-7$$
6. $$+(+9)+(-7)+(-1)+(-5)-(+7)=+9-7-1-5-7=-11$$
7. $$8-6+4-7-5=-6$$
8. $$3-2+5+8-4=10$$
9. $$+(+1)+(-3)+(+4)+(+6)-(-9)=+1-3+4+6+9=17$$
10. $$6-6-2+6-3=1$$
11. $$1-9+4+4-3=-3$$
12. $$-4+1+5+8+5=15$$
Oefeningengenerator vanhoeckes.be/wiskunde 2021-12-02 02:36:24