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зоя01
@зоя01
July 2022
1
6
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пожалуйста
решите уровнение
[tex] log_{7} (5x-2)= log_{7} (x+10)[/tex]
[tex] log_{4} x+ log_{4} (x-3)=1[/tex]
решите неравенства
[tex]log_{2} (2x+4) \leq 3[/tex]
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sedinalana
Verified answer
1
5x-2⇒x>0,4
x+10>0⇒x>-10
x∈(0,4;∞)
5x-2=x+10
5x-x=10+2
4x=12
x=3
2
x>0
x-3>0⇒x>3
x∈(3;∞)
log(4)(x²-3x)=1
x²-3x=4
x²-3x-4=0
x1+x2=3 U x1*x2=-4
x1=-1∉(3;∞)
x=4
3
{2x+4>0⇒2x>-4⇒x>-2
{2x+4≤8⇒2x≤4⇒x≤2
x∈(-2;2]
sirca
sirca
1)
2)
подходит только х=4
3)
1 votes
Thanks 1
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Answers & Comments
Verified answer
15x-2⇒x>0,4
x+10>0⇒x>-10
x∈(0,4;∞)
5x-2=x+10
5x-x=10+2
4x=12
x=3
2
x>0
x-3>0⇒x>3
x∈(3;∞)
log(4)(x²-3x)=1
x²-3x=4
x²-3x-4=0
x1+x2=3 U x1*x2=-4
x1=-1∉(3;∞)
x=4
3
{2x+4>0⇒2x>-4⇒x>-2
{2x+4≤8⇒2x≤4⇒x≤2
x∈(-2;2]