сократите дробь 48\72 ,42\54,26*17\51*39

 48

-----  = можем и числитель и знаменатель поделить на 12,получим:

 72

48:12 = 4 

72:12 = 6

48         4                                                        2

------ = ----- = и еще сокращаем на 2 = ------

 72        6                                                        3

 42                                             21                                                7

------ = сокращаем на 2 = --------- = сокращаем на 3 = ----------

 54                                             27                                                9

26*17          26*1               26

---------- = ----------- = ---------------

51*39          3*39              117

17:17 = 1

51:17 = 3

помогла?поблагодарите!