'-степень /дробная черта
а) 45'3/-27n'4
б)6(a-2)/15(a-2)=6/15=3/2=1,5
в)(n-3)(n+3)/4(n-3)=n+3/4
<span>(2 ^3√4)^x=8
2^6x=8
log_2(8)=6x
6x=3
x=3/6=1/2=0.5</span>
[3cos5x-4cos5x*cosx]/[3sin5x-4sin5xcosx]=tg17x
cos5x(3-4cosx)/sin5x(3-4cosx)=tg17x
cosx≠3/4
ctg5x=tg17x
tg17x-tg(π/2-5x)=0
sin(22x-π/2)/cos17x*cos(π/2-5x)=0
cos17x≠0 U cos(π/2-5x)=sin5x≠0
sin(22x-π/2)=0
22x-π/2=πn
22x=π/2+πn
x=π/44+πn/22
Cos130:1/2sin70*cos70=cos130:1/4sin140=4cos130/sin140=-4*(-sin40)/sin40=4