42. =ln42 /(1/3ln42)=3
43.=log(5) 5 /log(5)4 *log(5) 4^3=3log(5) 4 / log(5) 4=3
44.=log(5^4) 7 *log(7) 5=1/(4log(7) 5 *log(7) 5=1/4=0,25
45. =102*(1/6)=17
46. =108* 1/8=13,5
47.=log(81) log(7) 7^3=log(81) 3=1/log(3) 3^4=1/4=0,25
48=5*2^log(2) 3^2 *4=5*9*4=180
49=7^log(7) 4^3=4^3=64
50.=12^(2log(12) 14)=12^log(12) 14^2=14^2=196
51.=log(4) (25,6*10)=log(4) 256=log(4) 4^4=4log(4) 4=4
52=3^4 *3^log(3) 6=81*6=486
53.=2^2 *2^log(4) 121=4* 2^(log(2) 121 /log(2) 4)=4*121^(1/2)=4*11=44
54.=4+(-2)=2
55.=log(2) 8 /log(2) 4 +2=3/2 +2=3.5
56.=42/7=6
57.=log(5) (12,5*10)=log(5) 125=3
58.=1-2log(9) 45 +(log(9) 45)^2=1-2(log(9)9+log(9) 5 ) +(1+log(9) 5)^2=
=1-2-2log(9) 5+1+2log(9) 5 +(log(9) 5 )^2=(log(9) 5)^2
59.=1 /log(7) 0,2 *log(7) 0,04=log(7) 0,,2^2 / log(7) 0,2=2
60=log(0,7) (10/7)=-1