[(5/4-3/8)*5/26+1/8*5/26]/30/13

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[(5/4-3/8)*5/26+1/8*5/26]/30/13[(5/4-3/8)*5/26+1/8*5/26]/30/13[(5/4-3/8)*5/26+1/8*5/26]/30/13[(5/4-3

[(5/4-3/8)*5/26+1/8*5/26]/30/13
[(5/4-3/8)*5/26+1/8*5/26]/30/13

[(5/4-3/8)*5/26+1/8*5/26]/30/13
[(5/4-3/8)*5/26+1/8*5/26]/30/13
=[(5/4-3/8+1/8)*5/26]/30/13
=[(5/4-2/8)*5/26]/30/13
=(5/4-1/4)*(5/26)*(13/30)
=1/12