Question

1.Tìm x

a.(1/2) mũ x=1/64

b.3 mũ 5:3 mũ x=9

giúp mk nhé.Thank nhìu

Answer 1

a, (\(\frac{1}{2}\))^x = \(\frac{1}{64}\)

<=> (\(\frac{1}{2}\))^x = (\(\frac{1}{2}\))⁶

<=> x = 6

b, 3⁵ :3^x = 9

<=> 3⁵ :3^x = 3² 

<=> 3^x = 3⁵ :3²

<=> 3^x = 3³

<=> x = 3

Chúc bạn học tốt

Answer 2

a,\(\left(\frac{1}{2}\right)^x=\frac{1}{64}\)

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

\(\Rightarrow x=6\)

b,\(3^5:3^x=9\)

\(3^5:3^x=3^2\)

\(3^x=3^5:3^2\)

\(3^x=3^3\)

\(\Rightarrow x=3\)

Answer 3

\(a,\left(\frac{1}{2}\right)^x=\frac{1}{64}\)

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

\(\Rightarrow x=6\)

Vậy...

\(b,3^5:3^x=9\)

\(\Rightarrow3^5:3^x=3^2\)

\(\Rightarrow3^x=3^3\)

\(\Rightarrow x=3\)

Vậy...