Ответы и объяснения

2014-02-13T16:51:16+04:00
5/12х = 51/100+4/15 = 233/30
х = 233/300 : 5/12 = 233/125 = 1,864

0,8х = 8/15
8/10х = 8/15
х = 8/15 :8/10 = 2/3

2/3х = 16/5-4/9 = 124/45
х = 62/15 = 4 2/15