Question

3x (12x-4)-9x(4x-3)=30

tìm x

Answer 1

\(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)

\(36x^2-12x-36x^2+27x=30\)

\(15x=30\)

\(x=2\)

Answer 2

Giải:

\(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)

\(\Leftrightarrow36x^2-12x-36x^2+27x=30\)

\(\Leftrightarrow-12x+27x=30\)

\(\Leftrightarrow15x=30\)

\(\Leftrightarrow x=\dfrac{30}{15}\)

\(\Leftrightarrow x=2\)

Vậy \(x=2\).

Chúc bạn học tốt!!!

Answer 3

3x (12x-4) -9x( 4x-3) = 30

3x.12x- 3x.4 -9x.4x+ 9x.3= 30

36x\(^2\)-12x-36x\(^2\) +18x =30

6x = 30

=> x= 5

Chúc bạn học tốt !!

Answer 4

3x(12x-4) – 9x(4x-3) = 30

=> 3x.12x – 3x.4 – 9x.4x +9x.(-3) = 30

=> 36x² – 12x -36x² + 27x = 30

=> -12x + 27x = 30

=> 15x = 30

=> x = 30 : 15

=> x = 2