Ответы и объяснения

2013-03-26T13:13:37+00:00

a(k+c)=(7+m)b²/5 / *5

5a(k+c)=(7+m)b²  / :(7+m)

(5a(k+c))/(7+m)=b²

b=√((5a(k+c))/(7+m))