
Высоцкий
6 год назад
Прошу помочь , гении алгебры ! 1 задание на Ваше усмотрение

ОТВЕТЫ

Алабышев
Jun 29, 2019
3^|x|=a
a-8-(a+9)/(a²-4a+3)≤5/(a-1)
a²-4a+3=(a-1)(a-3)
a1+a2=4 U a1*a2=3⇒a=1 u a=3
(a-1)(a-3)≠0⇒a≠1 U a≠3
a-8≤5/(a-1)+9/(a-3)(a-1)
a-8≤(5a-15+a+9)/(a-1)(a-3)
a-8≤(6a-6)/(a-1)(a-3)
a-8≤69a-1)/(a-3)(a-1)
a-8≤6/(a-3)
(a-8)-6/(a-3)≤0
(a²-3a-8a+24-6)/(a-3)≤0
(a-11a+18)/(a-3)≤0
a²-11a+18)=(a-2)(a-9)
a1+a2=11 U a1*a2=18⇒a1=2 U a2=9
a-3=0⇒a=3
_ + _ +
-----------------[2]---------------(3)------------------[9]-----------------
a≤2⇒3^|x|≤2⇒|x|≤log(3)2⇒-log(3)2≤x≤log(3)2
3lt;a≤9⇒3lt;3^|x|≤9⇒1lt;|x|≤2⇒
{|x|gt;1⇒xlt;-1 U xgt;1
{|x|≤2⇒-2≤x≤2
-2≤xlt;-1 U 1lt;x≤2
Ответ x∈[-log(3)2;0) U (0;log(3)2] U [-2;-1) U (1;2]
a-8-(a+9)/(a²-4a+3)≤5/(a-1)
a²-4a+3=(a-1)(a-3)
a1+a2=4 U a1*a2=3⇒a=1 u a=3
(a-1)(a-3)≠0⇒a≠1 U a≠3
a-8≤5/(a-1)+9/(a-3)(a-1)
a-8≤(5a-15+a+9)/(a-1)(a-3)
a-8≤(6a-6)/(a-1)(a-3)
a-8≤69a-1)/(a-3)(a-1)
a-8≤6/(a-3)
(a-8)-6/(a-3)≤0
(a²-3a-8a+24-6)/(a-3)≤0
(a-11a+18)/(a-3)≤0
a²-11a+18)=(a-2)(a-9)
a1+a2=11 U a1*a2=18⇒a1=2 U a2=9
a-3=0⇒a=3
_ + _ +
-----------------[2]---------------(3)------------------[9]-----------------
a≤2⇒3^|x|≤2⇒|x|≤log(3)2⇒-log(3)2≤x≤log(3)2
3lt;a≤9⇒3lt;3^|x|≤9⇒1lt;|x|≤2⇒
{|x|gt;1⇒xlt;-1 U xgt;1
{|x|≤2⇒-2≤x≤2
-2≤xlt;-1 U 1lt;x≤2
Ответ x∈[-log(3)2;0) U (0;log(3)2] U [-2;-1) U (1;2]
.....................................................
12