(2,7х -5) -(3,1х -4)=2,7х -5 -3,1х +4= - 0,4х -1
= 4cos(3π/2-π/3)-tg(π/2+π/4)= -4sin(π/3)-ctg(π/4) = -2√3-1
3) 4
4) 1
5) 3
6) 2
7) 1
8) 4
9) 3
10) 3
5x - 2( X - 1 ) > = 17 + 4x
5x - 2x + 2 > = 17 + 4x
3x - 4x > = 17 - 2
- X > = 15
X < = - 15
Ответ ( - бесконечность ; - 15 ]
17*х=4
х=4:17
х= 0,24(приблизительно)