упростите вырожения: 1) 2) 3) 4) - id1699695720220915 от Subota 15.09.2022 03:00

Question

Алгебра: упростите вырожения: 1) 2) 3) 4)

Subota · Accepted Answer

1) 27*2^x-8*3^x=0 /3^x
27*(2/3)^x - 8 = 0
(2/3)^x = 8/27
(2/3)^x = (2/3)^3
x = 3
ответ: х = 3

2) 2^(x+1) - 2^(x-1)=3^(2-x)
2*(2^x) - (1/2)*(2^x) = 9/(3^x)
(2^x) *(2 - 1/2) = 9/(3^x)
(2^x)*(3/2) = 9/(3/2)
(6^x) = 6^1
x = 1
ответ: х = 1

3) 9*(4^x) - 13*(6^x) + 4*(9^x) = 0
9*(2^2x) - 13*(2^x)*(3^x) + 4*(3^2x) = 0 /(3^2x)
9*(2/3)^2x - 13*(2/3)^x + 4 = 0
(2/3)^x = t
9t^2 - 13t + 4 = 0
D = 169 - 4*9*4 = 25
t1 = (13 - 5)/18
t1 = 4/9
t2 = (13 + 5)/18
t2 = 1
1) (2/3)^x = 4/9
(2/3)^x = (2/3)^2
x1 = 2
2) (2/3)^x = 1
(2/3)^x = (2/3)^0
x2 = 0
ответ: x1 = 2; x2 = 1

упростите вырожения:
1) $5\sqrt{2}-4\sqrt{8}+3\sqrt{32}$
2) $(\sqrt{75} -\sqrt{12})\sqrt{3}$
3) $(\sqrt{7}-3)^{2}$
4) $(\sqrt{5}+2\sqrt{2})(\sqrt{5}-2\sqrt{2})$

MOGZ ответил