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69lolka69
@69lolka69
October 2021
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Решите уравнения. Спасибо заранее.
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Verified answer
1)4^x=8
2^(2x)=2^3
2x=3
x=3\2
x=1.5
___________
2)3^(x-1)=27
3^(x-1)=3^3
x-1=3
x=3+1
x=4
__________
3)(1/2)^(2x-1)=16
2^(1-2x)=2^4
1-2x=4
2x=1-4
2x=-3
x=-3/2
x=-1,5
_______________
4)10^(x^2+x)=100
10^(x^2+x)=10^2
x^2+x=2
x^2+x-2=0
По Th Виетта:
x1=-2
x2=1
2 votes
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Answers & Comments
Verified answer
1)4^x=82^(2x)=2^3
2x=3
x=3\2
x=1.5
___________
2)3^(x-1)=27
3^(x-1)=3^3
x-1=3
x=3+1
x=4
__________
3)(1/2)^(2x-1)=16
2^(1-2x)=2^4
1-2x=4
2x=1-4
2x=-3
x=-3/2
x=-1,5
_______________
4)10^(x^2+x)=100
10^(x^2+x)=10^2
x^2+x=2
x^2+x-2=0
По Th Виетта:
x1=-2
x2=1