25又10/39*3/5-43又1/13/7

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25又10/39*3/5-43又1/13/7

25又10/39*3/5-43又1/13/7
25又10/39*3/5-43又1/13/7

25又10/39*3/5-43又1/13/7
25又10/39*3/5-43又1/13/7
=(25+10/39)*(3/5)-(42+14/13)/7
=15+(2/13) -6-(2/13)
=9