Question

[Đào Lê Tuấn Tú]

tim so tu nhien n biet rang

a)  2ⁿ = 8.                   c)2ⁿ . 4 = 16

b) 2ⁿ : 2 = 8               d)3ⁿ . 2³ = 6³

e) 3^x . 3 = 243                 f) 2^x . 162 = 1024                g) 64.4^x = 168

Answer 1

[Chuu]

`2^n : 2 = 8`

`2^n = 8 xx 2`

`2^n = 16`

`2^n = 2^4`

`=> n=4`

________________________

`3^n . 2^3 = 6^3`

`3^n . 8 = 216`

`3^n = 216 : 8`

`3^n = 27`

`=> 3^n = 3^3`

`=> n=3`

Answer 2

[Nguyễn Việt Hoàng]

a) \(2^n=8\Leftrightarrow2^n=2^3\Leftrightarrow n=3\)

b) \(2^n:2=8\Leftrightarrow2^n=4\Leftrightarrow n=2\)

c) \(2^n.4=16\Leftrightarrow2^n=4\Leftrightarrow n=2\)

d)\(3^n.2^3=6^3\Leftrightarrow3^n=27\Leftrightarrow n=3\)

e) \(3^x.3=243\Leftrightarrow3^x=81\Leftrightarrow x=4\)