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bullycs
@bullycs
July 2022
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5*25^1/x+3*10^1/x больше или равно 2*4^1/x
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nKrynka
5*(25^(1/x)) + 3*(10^(1/x)) ≥ 2*(4^(1/x))
5*(5^(2/x)) + 3*(2^(1/x)2*(5^(1/x)) - 2*(2^(2/x)) ≥ 0 делим на [(2^(2/x)]
5*(5/2)^(2/x) + 3* (5/2)^(1/x) - 2 ≥ 0
(5/2)^(1/x) = z, z > 0
5*(z^2) + 3z - 2 ≥ 0
D = 9 + 4*5*2 = 49
z1 = (- 3 - 7)/10
z1 = - 1< 0 посторонний корень
z2 = (- 3+ 7)/10
z2 = 2/5
(5/2)^(1/x) = 2/5
(5/2)^(1/x) =(5/2)^(-1)
1/x = = - 1
x = - 1
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Answers & Comments
5*(5^(2/x)) + 3*(2^(1/x)2*(5^(1/x)) - 2*(2^(2/x)) ≥ 0 делим на [(2^(2/x)]
5*(5/2)^(2/x) + 3* (5/2)^(1/x) - 2 ≥ 0
(5/2)^(1/x) = z, z > 0
5*(z^2) + 3z - 2 ≥ 0
D = 9 + 4*5*2 = 49
z1 = (- 3 - 7)/10
z1 = - 1< 0 посторонний корень
z2 = (- 3+ 7)/10
z2 = 2/5
(5/2)^(1/x) = 2/5
(5/2)^(1/x) =(5/2)^(-1)
1/x = = - 1
x = - 1