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3x (12x -4 )- 9x (4x-3)= 30
<=>36x2-12x-36x3+27x=30
<=>15x=30
<=>x=2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)
\(36x^2-12x-36x^2+27x=30\)
\(15x=30\)
\(x=\frac{30}{15}\)
\(x=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
= 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
\(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)
\(\Leftrightarrow15x=30\)
\(\Leftrightarrow x=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
3x(12x - 4 ) -9x (4x -3 ) = 30
<=> 36x² - 12x - 36x²+27x = 30
<=> 15x = 30
<=> x=2
\(3x\left(12x-4\right)-9.\left(4x-3\right)=30\)
\(=>36x^2-12x-36x^2+27x=30\)
\(=>15x=30\)
\(x=30:15=2\)
Vậy x = 2.
~ Hok tốt ~
![](https://rs.olm.vn/images/avt/0.png?1311)
\(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)
\(\Leftrightarrow36x^2-12x-36x^2+27x=30\)
\(\Leftrightarrow27x-12x=30\)
\(\Leftrightarrow15x=30\)
\(\Leftrightarrow x=\frac{30}{15}=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
3x. (12x-4) -9x. (4x-4) = 30
<=>36x2-12x-36x2+36x=30
<=>24x=30
<=>x=30/24=5/4
Ta có
3x(12x-3)-9x(4x-4)=120
<=> 36x2-9x-36x2+36x=120
<=> 27x=120
=> x=40/9