Phân tích này ra nhìn cho dễ bạn nhé, ko thì nhẩm nhanh ra :>

(16-4x)(x+3)-x(1-4x)=39

<=>16(x+3)-4x(x+3)-x+4x²=39

<=>16x+48-4x²-12x-x+4x²=39

<=>(16x-12x-x)-(4x²-4x²)+48=39

<=>3x+48=39

<=>3x=-9

<=>x=-3

123123123 x 124 - 124124124 x 123

=123 x1001001 x 124 - 124124124 x 123

=123 x 124124124 - 124124124 x 123

=0

\(\frac{1}{4}:x=-\frac{7}{20}\)

\(x=\frac{1}{4}.-\frac{20}{4}\)

\(x=-\frac{5}{4}\)

hay không ???

Chắc khóc vì hết vé rùi :))

\(2x\left(x^2-25\right)=0\)

\(\Rightarrow\orbr{\begin{cases}2x=0\\x^2-25=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=0\\x=\pm5\end{cases}}\)

\(2x\left(3x-5\right)+\left(3x-5\right)=0\)

\(\left(2x+1\right)\left(3x-5\right)=0\)

\(\Rightarrow\orbr{\begin{cases}2x+1=0\\3x-5=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-\frac{1}{2}\\x=\frac{5}{3}\end{cases}}\)

\(9\left(3x-2\right)-x\left(2-3x\right)=0\)

\(9\left(3x-2\right)+x\left(3x-2\right)=0\)

\(\left(9+x\right)\left(3x-2\right)=0\)

\(\Rightarrow\orbr{\begin{cases}9+x=0\\3x-2=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-9\\x=\frac{2}{3}\end{cases}}\)

\(\left(2x-1\right)^2=25\)

\(\Rightarrow\orbr{\begin{cases}2x-1=5\\2x-1=-5\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=3\\x=-2\end{cases}}\)