а)(1 - 3\4) * (4\5-3\4) =
б)14 * (1\2+1\3+1\4) =
в)1\3 * 6\7-1\7 * 3\4 =

нз

а)(4/4-3/4)*(16/20-15/20)=1/4*1/20=1/80б)14*(6/12+4/12+3/12)=14/1*13/12=182/12=15цел 2/12 или 15цел 1/6в)2/7-3/28=56/196-21/196=35/196=5/28