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Скоротити дроби: а) 12/3 = 4; 18/24 = 3/4; 25/45 = 5/9; 14/84 = 1/6; б) 5/5 = 1; 32/36 = 8/9; 27/18 = 3/2; 72/16 = 9/2; в) 6/8 = 3/4; 27/15 = 9/5; 40/60 = 2/3; 45/90 = 1/2.