Question

5^2x-3 - 2.5² = 5².3  ai tra lời nhanh nhat minhk se  cko đg

Answer 1

5^2x-3 - 2.5² = 5².3

=> 5^2x-3 - 2.5²=25.3

=> 5^2x-3 - 2.5²=75

=> 5^2x-3 = 75+50

=> 5^2x-3=125

Ta có :

125=5³

=>  5^2x-3=5³

=> 2x-3=3

=> 2x=6

=> x=3

Answer 2

5\(^{2x-3}\)-2.5\(^2\)=5\(^2\).3

\(\Leftrightarrow\)5\(^{2x-3}\)=5\(^2\).3+ 5\(^2\).2=5\(^2\).(3+2)

\(\Leftrightarrow\)5\(^{2x-3}\)=5\(^2\).5=5\(^3\)

\(\Leftrightarrow\)2x-3=3

\(\Leftrightarrow\)2x=6

           x=3

Answer 3

bạn trên làm chậm hơn mình mak

Answer 4

cách chậm

Answer 5

5^{2x - 3} - 2.5² = 5².3

=> 5^{2x - 5} . 5² - 2.5² = 5².3

=> 5² . (5^{2x - 5} - 2) = 5².3

=> 5^{2x - 5} - 2 = 3

=> 5^{2x - 5} = 5

=> 2x - 5 = 1

=> x = 3

Answer 6

5^2x-3 - 2.5² = 5².3

=> 5^2x-3 - 2.5²=25.3

=> 5^2x-3 - 2.5²=75

=> 5^2x-3 = 75+50

=> 5^2x-3=125

Ta có :

125=5³

=>  5^2x-3=5³

=> 2x-3=3

=> 2x=6

=> x=3