Question

(7x-11)³ =2⁵.5² +200

tim x

Answer 1

\(\left(7x-11\right)^3=2^5.5^2+200.\)

\(\left(7x-11\right)^3=800+200\)

\(\left(7x-11\right)^3=1000\)

\(\left(7x-11\right)^3=10^3\)

\(\Leftrightarrow7x-11=10\)

\(\Leftrightarrow7x=10+11\)

\(\Leftrightarrow7x=21\)

\(\Leftrightarrow x=3\)

Vậy ...........

Answer 2

x bằng 3 nha bạn

Answer 3

Tìm x : 

( 7x - 11 )³ = 2⁵ . 5² + 200 

<=> ( 7x - 11 )³ = 32 . 25 + 200 

<=> ( 7x - 11 )³ = 800 + 200 

<=> ( 7x - 11 )³ = 1000 

<=> ( 7x - 11 )³ = 10³ 

<=> 7x - 11 = 10 

<=> 7x = 10 + 11 

<=> 7x = 21 

<=> x = 21 : 7 

<=> x = 3 

Vậy x = 3