Odpowiedzi

2010-02-27T13:41:43+01:00
Log(5)O,5+2log(5)20-3log(5)2=log(5)0,5*400/8=log(5)25=2
2010-02-27T13:46:19+01:00
Tu masz korzystanie z wzrorów na logarytmy:

log(a)[xy]=log(a)x+log(a)y
log(a)[x/y]=log(a)x-log(a)y
log(a)x^r=rlog(a)x

log(5)0,5+log(5)20^2-log(5)2^3=
=log(5)0,5+log(5)400-log(5)8=
=log(5)[0.5razy400]-log(5)8=
=log(5)200-log(5)8=
=log(5)[200/8]=
=log(5)25=
=2

myślę że pomogłam....