3x là 3.x hay là 3 nhân z?

36x²-12x-36x²+27x=30

15x=30

x=2

\(\Rightarrow36x^2-12x-36x^2+27x=30\)

\(\Rightarrow15x=30\Rightarrow x=\frac{30}{15}=2\)

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

=> 36x²-12x-36x²+27x=30

=> 15x=30

=> x=30:15

=> x=2

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

<=>36x²-12x-36x²+27x=30

<=>15x=30

<=>x=2

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

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

\(15x=30\)

\(x=2\)

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

\(\Rightarrow36x^2-12x-36x^2+27x=30\)

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

\(\Rightarrow15x=30\)

\(\Rightarrow x=2\)

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

\(\Rightarrow36x^2-12x-36x^2+27x=30\)

\(\Rightarrow15x=30\Rightarrow x=2\)

Vậy...............

Chúc bạn học tốt!!!

\(\Rightarrow36x^2-12x-36x^2+27x=30\)

\(\Rightarrow15x=30\Rightarrow x=30:15=2\)

3x(12x – 4) – 9x(4x – 3) = 30

3x.12x – 3x.4 – (9x.4x – 9x.3) = 30

36x2 – 12x – 36x2 + 27x = 30

(36x2 – 36x2) + (27x – 12x) = 30

15x = 30

x = 2

Vậy x = 2.

3x (12x -4 )- 9x (4x-3)= 30 

<=>36x²-12x-36x³+27x=30

<=>15x=30

<=>x=2

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

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

\(15x=30\)

\(x=\frac{30}{15}\)

\(x=2\)