Question

​​\(\left(2x-5\right)^2=0,81\)

\(\left(x-\frac{1}{3}\right)^3=0,027\)

\(5^{x+3}=7^{2-y}\)

\(2^{x+1}.3^y=12^x\)

Mấy bạn giúp mình nha. Mình cần gấp.

Answer 1

\(\left(2x-5\right)^2=0,81\)

\(\left(2x-5\right)^2=0,9^2\)

\(\Rightarrow2x-5=0,9\)

\(2x=0,9+5\)

\(2x=5,9\)

\(x=5,9:2\)

\(x=2,95\)

------------------------------------------

\(\left(x-\frac{1}{3}\right)^3=0,027\)

\(\left(x-\frac{1}{3}\right)^3=0,3^3\)

\(\Rightarrow x-\frac{1}{3}=0,3\)

\(x=0,3+\frac{1}{3}\)

\(x=\frac{19}{30}\)

Answer 2

\(\left(2x-5\right)^2=0,81\)

\(\Rightarrow2x-5=0,9\)

\(\Rightarrow2x=5,9\)

\(\Rightarrow x=2,95\)

\(\left(x-\frac{1}{3}\right)^3=0,027\)

\(\Rightarrow x-\frac{1}{3}=0,3\)

\(\Rightarrow x=\frac{19}{30}\)