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1. \(-9+84:(-7)\)
2. \(20+12:(-2)\)
3. \(32-8:4+9\)
4. \(-18+10.(-10)\)
5. \(-1+19.(-7)\)
6. \(7+19.(-4)\)
7. \(12+9:(-3)\)
8. \(144-24:6+11\)
9. \(48-8:2+3\)
10. \((-9).(-15)+10\)
11. \((-19).(-16)+20\)
12. \(-20+20-30\)

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Verbetersleutel

1. \(-9+84:(-7)=-9+ (-12)=-21\)
2. \(20+12:(-2)=20+ (-6)=14\)
3. \(32-8:4+9=32-2+9=39\)
4. \(-18+10.(-10)=-18+(-100)=-118\)
5. \(-1+19.(-7)=-1+(-133)=-134\)
6. \(7+19.(-4)=7+(-76)=-69\)
7. \(12+9:(-3)=12+ (-3)=9\)
8. \(144-24:6+11=144-4+11=151\)
9. \(48-8:2+3=48-4+3=47\)
10. \((-9).(-15)+10=135+10=145\)
11. \((-19).(-16)+20=304+20=324\)
12. \(-20+20-30=-30\)