[(2+2.3)-2/5]:4-3/2=?
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[(2+6)-2/5]:4-3/2
[8-2/5] : 4-3/2
40/5-2/5] : 4 -3/2
38/5 : 4 - 3/2
38/20 - 3/2
38/20 - 30/20
R= 8/20 = 4/10 = 2/5
[8-2/5] : 4-3/2
40/5-2/5] : 4 -3/2
38/5 : 4 - 3/2
38/20 - 3/2
38/20 - 30/20
R= 8/20 = 4/10 = 2/5
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