64х^4-65х²+1=0 пусть х²=а 64а²-65а+1=0
а1,2=(65+/-√4225-256)/128 = (65+/-√63)/128
а1=(65+63)/128=1 а2=2/128=1/64
х²=1 х=+/-1 х²=1/64 х=+/-1/8
Найдите значение выражения 8х+1/х ; при х=1 8+1=9
при х=-1 -8-1=-9 при х=1/8 1+8=9 при х=-1/8 -1-8=-9
итак,100%:4=(процент на игрока)=25%
т.к приза 2,то 25+25=50%
ответ:50%
tg20°*tg40°*tg60°*tg80°=
=tg20°*(tg60-20°)*tg60°*tg(60°+20°)=
= [tg20°*tg(60°-20°)tg(60°+20°)]*tg60°=
=[tg20°*((sin60°-20°)*sin(60°+20°)/(cos(60°-20°)cos(60°+20°))]*√3 =
=[tg20°*(√3/2 *cos20° -1/2 * sin20°)(√3/2 *cos20° +1/2 * sin20°) :
(1/2*cos20°+√3/2 *sin20°)(1/2*cos20°-√3/2 *sin20°)]*√3 =
=[tg20°*(3/4*cos²20°-1/4sin²20°)/(1/4*cos20°-3/4sin20°)]*√3 =
=[(sin20°/cos20°)*(3cos²20°-sin²20°)/(cos²20°-3sin²20°)]*√3=
=[(3cos²20°*sin20°-sin³20°)/(cos³20°-3sin²20°cos20°)]*√3=
=(sin3*20°)/cos(3*20°)*√3= (sin60°)/(cos60°)*√3 = tg60°*√3 =√3*√3=3
Y = kx + b
M ( 2 ; - 5 )
N ( 0 ; 2 )
-----------------
- 5 = 2k + b
2 = b
- 5 = 2k + 2
2k = - 7
k = - 3,5
ОТВЕТ y = - 3,5x + 2