Question

5^2x-3-2.5²=5².3

Answer 1

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

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

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

\(5^{2x-3}=5^1\)

=> 2x-3=1

2x=1+3

2x=4

x=4:2

x=2

Vậy x=2

Answer 2

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

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

\(5^{2x-3}-2.25=75\)

\(5^{2x-3}-2=75:25\)

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

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

\(5^{2x-3}=1\)

\(5^{2x-3}=5^0\)

\(\Rightarrow2x-3=0\)

\(2x=0+3\)

\(x=3:2\)

\(x=1.5\)

Vậy x = 1.5