.............19÷4*100=475 ☺..............
Решить что???????????????
Loq_6 (2-4x) ≤ 1 ;
0<2-4x≤ 6 ;
-6 ≤ 4x -2 < 0 ;
-6+2 ≤4x < 2 ;
- 4 ≤ 4x < 2 ;
-1 ≤ x < 1/2 .
ответ : x∈ [ -1; 0,5 ).
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√(3x² - 4x -2) =√(2x² -2x +1) ;
ОДЗ: { 3x² - 4x -2 ≥ 0 ; 2x² -2x +1 ≥ 0.
3x² - 4x -2 =2x² -2x +1 ;
x² -2x -3 =0 ;
[ x = - 1 ; x =3.
ответ : - 1 ; 3.
Tg(3π/4) +cos(5π/3)·sin(7π/6) - (sin(2π/3))² =
= -1+ ¹/₂·(-¹/₂) - (√3/2)² = -1- ¹/₄ -³/₄ = -2