(6:4)*5-7+25:(6,4*10)
(6:4)*5-7+25:(6,4*10); 7,5-7+25/64=5/10+25/64=160/320+125/320=285/320=57/64
(6/4)*5-7+25/(6,4*10)=1,5*5-7+25/64=7,5-7+25/64=0,5+25/64=32/64+25/64=57/64 Ответ:57/64
молдец!!!