все подробно  решение и ответ

а) 3/4*2/9

б) 12/13*13/15

в) 8/21*7/10

г) 7/5*15/14

д) 8/15*25/28

е) 2/15 * 5  /22

ж)9*5/6

з) 1/2*4

и) 4*5/9

 
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