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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....