Ответы и объяснения

2013-09-11T17:22:20+04:00
60.8:(5.3*a - 2.15) = 5
(5.3*a - 2.15) = 60.8 : 5
5.3*a - 2.15 = 12.16
5.3*а = 12.16 + 2.15
5.3*а = 14.31
а = 14.31 : 5.3
 а = 2.7