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7 × (34 □ 18) = 7 □ 34 + □ × 18
6 × (27 □ 33) = 6 × □□
(27 □ 9) × 5 = 27 □ 5+□×□
(6 + 27) □ 8)= 8 × □□+□×□


va rog frumos repede ! ​