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Complecteaza numerele care lipsesc folosind proprietatile inmultirii 2×21=2×(...×7)=(2×...)×7=...×7... . 5×18=5×(10+...)=(5×....)=.....+...=.... 2×35×1=2×(...7)×....=(....×....×)×(×7...)=....×....=....​