Question

Tìm x: 2^7x phần 2^3x=64

Answer 1

\(\frac{2^{7x}}{2^{3x}}=64\)

\(\Rightarrow\frac{\left(2^7\right)^x}{\left(2^3\right)^x}=2^6\)

\(\Rightarrow\left(\frac{128}{8}\right)^x=2^6\)

\(\Rightarrow16^x=2^6\)

\(\Rightarrow2^{4x}=2^6\)

\(\Rightarrow4x=6\)

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

Answer 2

Ta co          2^7x /  2^3x = 64

     ===>    2^7x-3x = 64

     ===> 2^4x = 64 = 2⁶

      ^{=====> 4x = 6}

     ===> x = 1,5

Answer 3

1,5 đó bạn