Ответы на вопрос:
1) 3 1/9: 1 1/6=28/9: 7/6=28/9*6/7=4/3*2/1=6/3=2 2)1 3/20: 4,6=1 3/20: 4 6/10 =1 3/20: 4 3/5=23/20: 23/5=23/20*5/23=1/4*1/1=1/4 3)3 3/7: (1: 1 1/6)-2 7/9=3 3/7: (1/1: 7/6)2 7/9=3 3/7: (1/1*6/7)-2 7/9=3 3/7: 6/7-2 /9=24/7: 6/7-2 7/9=24/7*7/6-2 7/9=4/1*1/1-2 7/9=4/1-2 7/9=4/1-25/9=36/9-25/9=11/9=1 2/9 4)3,1: х-1/6=1 5/9 3,1: х=1 5/9+1/6 3,1: х=14/9+1/6 3,1: х=28/18+3/18 3,1: х=31/18 х=31/18*3,1 х=31/18*3 1/10 х=31/18*31/10 х=961/180 х=5 61/180
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