Question

Tìm x thuộc N biết :

(3x-4).2 mũ 3=64

Answer 1

\(\left(3x-4\right).2^3=64\)

\(\Rightarrow3x-4=64:8=8\)

\(\Rightarrow3x=4+8=12\)

\(\Rightarrow x=4\)

Answer 2

(3x-4).2^3 = 64

=> (3x-4).8 = 64

=) 3x-4 = 8

=> 3x = 12

=> x = 12:3

=> x = 4 (tmđk)

Vậy, x = 4

Answer 3

\(\left(3x-4\right).2^3=64\)

\(3x-4=\frac{64}{2^3}\)

\(3x-4=\frac{2^6}{2^3}\)

\(3x-4=2^{6-3}\)

\(3x-4=2^3\)

\(3x=8+4\)

\(3x=12\)

\(x=4\)

vậy \(x=4\)

Answer 4

\(x=4\)