5^x+3 - 13 = 612

<=> 5^x+3  = 625

<=> 5^x+3 = 5⁴

<=> x + 3 = 4

<=> x = 1

\(5^x+3-13=162\)

\(\Rightarrow5^x+3=162+13\)

\(\Rightarrow5^x+3=175\)

\(\Rightarrow5^x=175-3\)

\(\Rightarrow5^x=172\)

\(\Rightarrow x\in\varnothing\)

5^x+3 - 13 = 612

5^x+3 = 625

5^x+3 = 5⁴

=> x + 3 = 4

x = 1

a) ( x - 17 ) : 21 - 3 = 7

    ( x - 17 ) : 21      = 7 + 3

    ( x - 17 ) : 21      = 10 

      x - 17              = 10 x 21

      x - 17              = 210

      x                     = 210 + 17

      x                     = 227

a) (x - 17) : 21 - 3 = 7

(x - 17) : 21 = 7 + 3

(x - 17) : 21 = 10

x - 17 = 10 x 21

x - 17 = 210

x = 210 + 17

x = 227

Vậy x = 227

Câu b mk ko hiểu

x= 5³:5

x=5²

25

x=25

(x+3)(5x+10)=0

x=-3 hoặc x=-2 

Vậy \(x\in\left\{-3;-2\right\}\)

Làm lại :V

(x-3)(5x+10)=0

x=3 hoặc x=-2 

Vậy \(x\in\left\{3;-2\right\}\)

5^x+1 = 612 + 13

5^x+1 = 625 = 5⁴

=> x + 1 = 4

=> x = 3

5^{x - 1} - 13 = 612

5^{x - 1} = 612 + 13

5^{x - 1} = 625

5⁴ = 625

x = 4 + 1

x = 5

\(5^{x-1}-13=612\)

\(5^{x-1}=612+13\)

\(5^{x-1}=625\)

\(5^{x-1}=5^4\)

\(x-1=4\)

\(x=4+1\)

\(x=5\)

a) (2x - 5)³ = 27

(2x - 5)³ = 3³

2x - 5 = 3

2x = 8

x = 4

b) 5^{x + 3} - 13 = 612

5^{x + 3} = 625

5^{x + 3} = 5⁴

x + 3 = 4

x = 1

\(5^{x-1}-13=612\)

\(\Leftrightarrow5^{x-1}=625\)

\(\Leftrightarrow5^{x-1}=5^4\)

\(\Leftrightarrow x-1=4\)

\(\Leftrightarrow x=5\)

5^x-1 - 13 = 612

5^x-1 = 612 + 13

5^x-1 = 625

5^x-1 = 5⁴

x+ 1 = 4

x = 4 - 1

x = 3