Question

Answer 1

a, \(3x-15-12\left(2x-1\right)=4x-4+2x\)

\(\Leftrightarrow3x-15-24x+12=6x-4\Leftrightarrow-21x-3=6x-4\Leftrightarrow-27x=-1\Leftrightarrow x=\dfrac{1}{27}\)

b, đk : x khác -5 ; 5 

\(x^2+10x+25-\left(x^2-10x+25\right)=3\Leftrightarrow20x=3\Leftrightarrow x=\dfrac{3}{20}\left(tm\right)\)

c, \(\left(2x-1\right)^2-\left(2x-1\right)\left(x-2\right)=0\Leftrightarrow\left(2x-1\right)\left(1-x+2\right)=0\Leftrightarrow x=\dfrac{1}{2};x=3\)

d, \(x^2-4x+3x-12=0\Leftrightarrow x\left(x-4\right)+3\left(x-4\right)=0\Leftrightarrow\left(x+3\right)\left(x-4\right)=0\Leftrightarrow x=-3;x=4\)