( 2x - 1 )^3 = 125
=> ( 2x - 1 )^3 = 5^3
=> 2x - 1 = 5
=> 2x = 5 + 1 = 6
=> x = 6 : 2
=> x = 3
Vậy x = 3
ta co:(2x-1)3=125
(2x-1)3=53
=>2x-1=5
2x=1+5=6
x=6:2=3
=>x=3
( 2x - 1 )3 = 125
(2x-1)3=53
=> 2x-1=5
2x=5+1=6
x=6:2
x=3
( 2x - 1 ) 3 = 125
=> ( 2x - 1 )3 = 53
=> 2x - 1 = 5
=> 2x = 5 + 1
=> 2x = 6
=> x = 6 : 2
=> x = 3
Chúc bạn học tốt nha !!!
Ta có:
( 2x - 1 ) ^3 =125
<=> (2x-1)^3=5^3
<=>2x - 1=5
<=>2x=5+1=6
<=>x=6:2=3
Vậy x=3
( 2x - 1 )3 = 125
(2x-1)3=53
=> 2x-1=5
2x=5+1=6
x=6:2
x=3