(5 1/10 + 2 3/5) : 4 1/5 - (3/4 + 1/20) · 1/2 = 1 13/30
1) 5 1/10 + 2 3/5 = 5 1/10 + 2 6/10 = 7 7/10
2) 3/4 + 1/20 = 15/20 + 1/20 = 16/20 = 4/5
3) 7 7/10 : 4 1/5 = 77/10 : 21/5 = 77/10 · 5/21 = (11·1)/(2·3) = 11/6 = 1 5/6
4) 4/5 · 1/2 = 4/10 = 2/5
5) 1 5/6 - 2/5 = 1 25/30 - 12/30 = 1 13/30
Ответ: 1 целая 13/30.
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(5 1/10 + 2 3/5) : 4 1/5 - (3/4 + 1/20) · 1/2 = 1 13/30
1) 5 1/10 + 2 3/5 = 5 1/10 + 2 6/10 = 7 7/10
2) 3/4 + 1/20 = 15/20 + 1/20 = 16/20 = 4/5
3) 7 7/10 : 4 1/5 = 77/10 : 21/5 = 77/10 · 5/21 = (11·1)/(2·3) = 11/6 = 1 5/6
4) 4/5 · 1/2 = 4/10 = 2/5
5) 1 5/6 - 2/5 = 1 25/30 - 12/30 = 1 13/30
Ответ: 1 целая 13/30.