Решить систему:
решаем неравенства
1)
+ - +
-----7----------81---
2)
1. 0.25x²>1; x∈(-oo;-2)∪(2;+oo)
x∈(-oo;-3]∪[4;+oo)
2) 0<0.25x²<1; x∈(-2;2)
x∈[-3;4] и с учетом условия x∈(-2;2)
объединяем все промежутки
---- (- 4) -------( - 3) ------( - 2) -------( - log₃7)-------(2 )----- (4 )----
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ответ : (-oo;-4)∪(-log₃7;2)∪(4;+oo)
Ответ:
Объяснение:
k/(k-4) + 8/(4-k)= 4/(k-4) - 8/(k-4)=(4-8)/(k-4)= -4/(k-4)
Log9 27 +Loq16 4 = Log3² 3³ +Loq4² 4 =3/2 +1/2 =2.
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* * *Loga^n a^m = m/n * * *
(5+x)^2=(5+x)(5+x)=25+5x+5x+x^2=25+10x+x^2