Question

{ x² - [ 6² - ( 8² - 9 . 7 )³ - 7 . 5 ]³ = 1

GIÚP MÌNH NHA CÁC BẠN

Answer 1

\(\Leftrightarrow\left\{x^2-\left[6^2-\left(64-63\right)^3-7\cdot5\right]^3\right\}=1\)

\(\Leftrightarrow\left\{x^2-\left[36-1-35\right]^3\right\}=1\)

\(\Leftrightarrow x^2=1\Rightarrow x=1\)

Answer 2

{ x² - [ 6² - ( 8² - 9.7)³ - 7.5]³ - 5.3 }³ = 1

{ x² + [ 36 - (64 - 63)³ - 35]³ - 15}³ = 1

[ x² - ( 36 - 1³ - 35 ) - 15 ]³ = 1

[ x² - ( 36 - 1 - 35 ) - 15]³ = 1

[ x² - ( 35 - 35 ) - 15]³ = 1

[ x² - 0 - 15]³ = 1

( x² - 15 )³ = 1

<=> ( x² - 15)³ = 1³

=> x² - 15 = 1

<=> x² = 16

=> x = 4