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- \(-11+8=\)
- \(-12+2=\)
- \(3-4=\)
- \(6-8=\)
- \(6-9=\)
- \(-9-8=\)
- \(-2+2=\)
- \(4-4=\)
- \(4-5=\)
- \(7-12=\)
- \(-9-2=\)
- \(8-9=\)
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Verbetersleutel
- \(-11+8=-3\)
- \(-12+2=-10\)
- \(3-4=-1\)
- \(6-8=-2\)
- \(6-9=-3\)
- \(-9-8=-17\)
- \(-2+2=0\)
- \(4-4=0\)
- \(4-5=-1\)
- \(7-12=-5\)
- \(-9-2=-11\)
- \(8-9=-1\)