Question

tìm x biết :

[( x - 81 )³ : 125 ] - 2³ = 0

Answer 1

x=91 bn nhe

thay dung thi kik cho mk nha

Answer 2

[(x-81)³:125]-2³=0

[(x-81)³:125]-8=0

(x-81)³:125     = 0+8

(x-81)³:125  =8

(x-81)³   = 8.125

(x-81)³   =100

(x-81)³=10³

=> x-81=100

=> x =100+81

=> x =181

Answer 3

mình quên 

=> x-81=10

=> x = 10+81

=> x =91

Answer 4

bạn ơi thế cái nào đúng vậy

Answer 5

\(\left[\left(x-81\right)^3:125\right]-2^3=0\)

\(\left[\left(x-81\right)^3:125\right]=8\)

\(\left(x-81\right)^3=1000\)

\(\Leftrightarrow x-81=10\)

\(\Rightarrow x=91\)