Question

5^2x-3-2.5² = 5².3

Answer 1

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

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

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

\(5^{2x-3}=5^3\Rightarrow2x-3=3\Rightarrow2x=6\Rightarrow x=3\)

Answer 2

5^{2x - 3} - 2 . 5² = 5² . 3

5^{2x - 3} - 2 . 25 = 25 . 3

5^{2x - 3} - 2 . 25 = 75

5^{2x - 3} - 50 = 75

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

5^{2x - 3} = 125

\(\Rightarrow\) 5^{2x - 3} = 5³

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

2x = 3 + 3

2x = 6

x = 6 : 2

x = 3.

Answer 3

5^2x-3-2.5²=5².3

5^2x-3 =5².3+2.5²

5^2x-3 =5²(3+2)

5^2x-3 =5².5¹

5^2x-3 =5³

2x-3 =3

2x =3+3

2x = 6

x = 6 : 2

x = 3

Vậy x = 3 .