Ответ:
23-2q
Объяснение:
3*(q+6)-5*(q-1)=3q+18-5q+5=23-2q
Sin(-11π/6).cos(19π/6).tg(5π/4)=
=sin(12π/6-11π/6).cos(3π+π/6).tg(π+π/4)=
=sin(π/6).cos(2π+π+π/6).tg(π/4)=
=1/2.cos(7π/6).1=1/2.(-cos(π/6)).1=
=1/2.(-√3/2).1=-√3/4
1340=(15-12.8)*х+60*15=900+2.2х
2.2х=440
х=200
В стаде 260 коров.