1)3^x=7⇒x=log(3)7
2)log(4)x=log(0,5)√2⇒log(2)x/2=log(2)√2/-1⇒log(2)x=-2*1/2=-1
3)lgx=1/3lg54+lg5-1/3lg16=lg5*∛54/∛16=lg5*∛54/16=lg5*∛27/8=lg5*3/2=lg7,5⇒x=7,5
4)log(2)x=lg5/lg0,5+log(4)225=log(0,5)5+log(4)225=-log(2)5+1/2log(2)225=
=1/2(-log(2)25+log(2)225)=1/2log(2)225/25=1/2log(2)9=log(2)3⇒x=3
5)log(√3)∛2+log(∛3)∛4-log(3)∛256=2log(3)∛2+3log(3)∛4-log(3)∛256=
log(3)∛256/256=log(3)1=0