Question

tìm x \(\in\)N biết

5^x+1 . 10=1250

Answer 1

5^x+1 . 10 = 1250

=> 5^x+1 = 1250 : 10 = 125

=> 5^x+1 = 5³

=> x + 1 = 3

=> x = 3 - 1 = 2

Answer 2

\(5^{x+1}.10=1250\)

\(\Rightarrow5^{x+1}=1250:10\)

\(\Rightarrow5^{x+1}=125\)

\(\Rightarrow5^{x+1}=5^3\)

\(\Rightarrow x+1=3\)

\(\Rightarrow x=3-1\)

\(\Rightarrow x=2\)

Answer 3

5^x+1=1250:10

5^x+1=125

5^x+1=5^3

=>x+1=3

     x    =3-1

 vậy x =2