19.75-(1.75×13/8+1又4/3×13/5)

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19.75-(1.75×13/8+1又4/3×13/5)19.75-(1.75×13/8+1又4/3×13/5)19.75-(1.75×13/8+1又4/3×13/5) 

19.75-(1.75×13/8+1又4/3×13/5)
19.75-(1.75×13/8+1又4/3×13/5)

19.75-(1.75×13/8+1又4/3×13/5)