57,4:4+1 1/6 : 4 2/3 - (2,7+5 1/20) * 0,8
———————————————————-
2 1/15 -(1 2/3+1/5)
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57,4:4+1 1/6 : 4 2/3 - (2,7+5 1/20) * 0,8
———————————————————-
2 1/15 -(1 2/3+1/5)