Question

Tim x biet:

\(\left(\frac{2}{7}\right)^{6.x-7}=1\)

Answer 1

x=10 cách lm thì chờ xem lại

Answer 2

\(\left(\frac{2}{7}\right)^{6x-7}=1\)

\(\Rightarrow\left(\frac{2}{7}\right)^{6x-7}=\left(\frac{2}{7}\right)^0\)

\(\Rightarrow6x-7=0\)

\(\Rightarrow6x=7\Leftrightarrow x=\frac{7}{6}\)

 

Answer 3

\(\left(\frac{2}{7}\right)^{6x-7}=1\)

\(\Rightarrow6x-7=0\)

\(6x=0+7\)

\(6x=7\)

\(\Rightarrow x=1\frac{1}{6}\)

Vậy \(x=1\frac{1}{6}\)