60     
Решите пропорцию:
а)2х/3=4/9 
б)3х/5=9/10
в)8/15=6х/9
г)12/13=18х/39 
                                        61
а)1/5=2:3
б)2/7=3/4х
в)21/25=49/50х
г)16/19=32:38х 

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