1 3 2 − = + = − = + = − = + = − = + = 16 19 3 3 14 − 3 = + = 19 − 9 = + = 18 − 6 = + = 17 − 5 = + = 16 − 0 = + = 15 − 4 = + = 18 − 1 = + = 20 − 2 = + = 19 − 7 = + = 11 11 21 Umkehraufgaben Nur zu Prüfzwecken – Eigentum des Verlags öbv
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