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

36x² -12x-(36x² -16x-27x-12) = 9

36x² -12x-36x² -16x+27x+12 = 9

-x = 9-12

-x = -3

x= -3 : -1

x= 3

vậy x= 3

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

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

\(\Leftrightarrow27x-12x=30\) 

\(\Leftrightarrow15x=30\) 

\(\Leftrightarrow x=\frac{30}{15}=2\)

= 36x² -12x -36x² +27x =30

5x =30

x   = 6

nhanh k bn

x=6

k cho mình , mình k trả.

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

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

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

\(15x=30\)

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

\(x=2\)

= 36X-12X-36X-27X=30

=36X-36X-12X-27X=30

=0-12X-27X

=-12X-27X=30

=X.(-12-27)=30

hình như mình tính sai

nếu công thức đúng thì k nha

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

\(\Leftrightarrow15x=30\)

\(\Leftrightarrow x=2\)

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

=>36.x²+12x-36.x²-27x=30

=>12x-27x=30

=>-15x=30

=>x=30:(-15)

=>x=-2

vậy......