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story12
@story12
August 2022
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Решите уравнение:
[tex]7 ^{3+4x}=0,49* 10^{3+4x} [/tex]
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Checov7400
49/100=7^2/10^2
7^3+4x/10^3+4x=7^2/10^2
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Алкадиеныч
Verified answer
ПУСТЬ 3+4Х=t
7^t=0,49*10^t
(7/10)^t =0,49
0,7^t=(0,7)^2
t=2
3+4X=2 4X=-1 X=-1/4
0 votes
Thanks 0
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Answers & Comments
7^3+4x/10^3+4x=7^2/10^2
Verified answer
ПУСТЬ 3+4Х=t7^t=0,49*10^t
(7/10)^t =0,49
0,7^t=(0,7)^2
t=2
3+4X=2 4X=-1 X=-1/4