9x-5-4(x-5)=0
9x-5-4x+20=0
9x-4x=-15
x=-3
Ctg(-765°) - 2cos(19π/3) = ctg(-765° + 720°) - 2cos(19π/3 - 18π/3) =
= ctg(-45°) + 2cos(π/3) = -1 + 2*0,5 = -1 + 1 = 0
Ответ: 0
=пи/3................................................
Ответ:
1) 47008÷904=52
2) 52272-52264=8
3) 52*537=27924
4) 46*8=368
5) 380193-200785=179408
6) 179408-27924=151484
7) 151484-368=151116
380193-200785-537*(47008:904)-46*(52272-52264) = 151116