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Antwort zur Frage 343:

Nenne 4 Rechenoperationen mit ihren Umkehroperationen samt Beispielen

Die Umkehroperation einer Rechenoperationen hebt deren Wirkung auf, d.h. man bekommt wieder den Ausgangsterm.

Rechen- Umkehr- Beispiel Umkehr- operation operation operation

+ − 8+3=11 11−3=8

− + 8−3=5 5+3=8

· : 8·3=24 24:3=8

: · 8:3= 83 83·3=8

()2

52=25 √ 25=5

√ ()2

25=5 52=25 10() log() 102=100 log(100) =2 log() 10() log(100) =2 102=100 Beispiele zur Hintereinanderausf¨uhrung von Rechen- operation und zugeh¨origer Umkehroperation:

(8+3)−3=8 (8−3) +3=8 (8·3) :3=8 (8:3)·3=8

√52=5 (√

5)2=5

log(102) =2 10(log2)=2

Verallgemeinerungen f¨ur Potenzen:

Rechenoperation Umkehroperation

()nn

b() logb()

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