250 - ( 2x - 10 ) 3 = 125
( 2x - 10 ) 3 = 125
( 2x - 10 ) 3 = 5 3
=> 2x - 10 = 5
2x = 15
x = 7,5
250 - (2x -10)3 =125
=> (2x -10)3 = 250 - 125
=> (2x -10)3 =125
=> (2x -10)3 =53
=> 2x -10 =5
=> 2x =5 + 10
=> 2x = 15
=> x = 15 : 2
=> x = 7,5
\(205-\left(2x-10\right)^3=125\)
\(\Rightarrow\left(2x-10\right)^3=125\)
\(\Rightarrow\left(2x-10\right)^3=5^3\)
\(\Leftrightarrow2x-10=5\)
\(\Rightarrow2x=15\)
\(\Rightarrow x=\frac{15}{2}\)
vậy x= \(\frac{15}{2}\)
250 - (2x - 10)3 = 125
(2x - 10)3 = 250 - 125
(2x - 10)3 = 125
(2x - 10)3= 53
=> 2x - 10 = 5
2x = 5 + 10 = 15
x = 15 : 2 = 7\(\frac{1}{2}\)