57.6:4+1 1/6:4 2/3-(2.7+5 1/20) ×0.8 2 1/15-(1 2/3+1/5)

Question

57.6:4+1 1/6:4 2/3-(2.7+5 1/20) ×0.8
2 1/15-(1 2/3+1/5)

Comments

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Answer 1

57.6:4+1 1/6:4 2/3-(2.7+5 1/20) ×0.8=8,45
1)2 7/10+5 1/20=7 14/20+1/20=7 3/4
2)57,6:4=14,4
3)7/6:14/3=7/6*3/14=1/4
4)7 3/4*0,8=6,2
5)14,4+0,25=14,65
6)14,65-6,2=8,45
////// 2 1/15-(1 2/3+1/5)= 31/15-(5/3+1/5)=31/15-(25/15+3/15)= 31/15-28/15=3/15=1/5