x^(lgx - 2) = 1000
x>0
логарифмируем по основанию 10
lg (x^(lgx - 2)) = lg 10^3
lgx * (lgx - 2) = 3
lg x = t
t^2 - 2t - 3 = 0
D = 4 + 12 = 16
t12 = (2 +- 4)/2 = 3 -1
t=-1
lg x = -1
x = 1/10
t = 3
lg x = 3
x = 1000
ответ 1/10. 1000
X^lgx - 2=1000
x^lgx = 1002
lg^2 x = lg (1002)
lg x = +- √lg 1002
x = 10^(+-√lg 1002)
x^(lgx - 2) = 1000
x>0
логарифмируем по основанию 10
lg (x^(lgx - 2)) = lg 10^3
lgx * (lgx - 2) = 3
lg x = t
t^2 - 2t - 3 = 0
D = 4 + 12 = 16
t12 = (2 +- 4)/2 = 3 -1
t=-1
lg x = -1
x = 1/10
t = 3
lg x = 3
x = 1000
ответ 1/10. 1000
X^lgx - 2=1000
x^lgx = 1002
lg^2 x = lg (1002)
lg x = +- √lg 1002
x = 10^(+-√lg 1002)