2 1/7 : 5/6 * 7/9 - 1,9 = 0,1
1) 2 1/7 : 5/6 = 15/7 * 6/5 = 18/7 = 2 4/7
2) 18/7 * 7/9 = 18/9 = 2
3) 2 - 1,9 = 0,1
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2 1/7 : 5/6 * 7/9 - 1,9 = 0,1
1) 2 1/7 : 5/6 = 15/7 * 6/5 = 18/7 = 2 4/7
2) 18/7 * 7/9 = 18/9 = 2
3) 2 - 1,9 = 0,1
1)2 1/7:5/6=15/7:5/6=15*6/7*5=18/7=2 4/7
2)18/7*7/9=2
3) 2-1,9=0,1