ПОМОГИТЕ ОЧЕНЬ НАДО,ПОЖАЛУЙСТА!!!! Найдите неизвестный член пропорции:а) x/10=4/5  б) 6/a=3/4 в) 0.4/b=2/7 г) 3/8=y/3.2 д) 3:y=2:5 е) 6:7=9:с ж) x:1.4=3:0.7 з) 9:0.8=a:1.6

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