помогите с логорифмом log_(1/2)⁡(2х-1) + log_(1/2)⁡(х+3)=-2
и с неравенством :
а) 21^3х-5 > 1
б) log_2,5⁡(х-1)≤0
в) (1/2)^(х^(2+5х) )<16
г) log_5⁡(6-х) >log_5⁡(2х-1)
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