Question

5^2x-3-2.5² =5² . 3

 

Answer 1

 

Answer 2

 

5^2x-3-2.5² =5² . 3

⇔5^2x-1.5²-2.5²=5².3

⇔5².(5^2x-1-2)=5².3

⇔5^2x-1-2=3

⇔5^2x-1=5

⇔2x-1=1

⇔2x=2

⇔x=1

vay x=1

 

 

 

 

Answer 3

af nham mink sai :>
 

 

Answer 4

\(5^{2x-3}-2.5^2=5^2.3\)

\(5^{2x-3}-2.25=25.3\)

\(5^{2x-3}-50=75\)

\(5^{2x-3}=75+50\)

\(5^{2x-3}=125\)

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

\(2x-3=3\)

\(2x=3+3\)

\(2x=6\)

\(x=6:2\)

\(x=3\)