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b) (94,5^2-30,5^2): ((69^3+29^3):98-69*29)=(94.5+30.5)(94.5-30.5)/(69:2-69*29+29^2-69*29)= 125*64/(69-29)^2=5^3*4^3/40^2=20^3/40^2=8000/1600=5
Log₁/₃(x-5)>1 ОДЗ: х-5>0 х>5
x-5<1/3¹
x-5<1/3
x<5¹/₃
Ответ: х∈(5;5¹/₃).
(-2х+1)(-2х-7)=0
-(2x-1)(-2x-7)=0
(2x-1)(2x+7)=0
x=1/2
x=-3.5