1) 5 2/5*2 6/7=27/5*20/7=108/7
2) 20/7*12/5=48/7
3) 108/7-48/7=60/7=8 4/7
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1) 5 2/5*2 6/7=27/5*20/7=108/7
2) 20/7*12/5=48/7
3) 108/7-48/7=60/7=8 4/7