Câu trả lời:
\(a)\)\((x-5+3)(x-5)=0\Leftrightarrow (x-2)(x-5)=0\Leftrightarrow x=2,x=5\)
b)\(\dfrac{14x-7}{21}-\dfrac{15x+6}{21}=\dfrac{21x+63}{21}\Leftrightarrow 14x-7-15x-6-21x-63=0\Leftrightarrow -22x-76=0\Leftrightarrow x=-\dfrac{38}{11}\) c) ĐKXĐ x khác 2 và -2
\(\dfrac{x^{2}-3x+2}{(x-2)(x+2)}-\dfrac{x^{2}+2x}{(x-2)(x+2)}+\dfrac{7x-6}{(x-2)(x+2)}=0\)\(\Leftrightarrow 2x-4=0\Leftrightarrow x=2(loại)\)\(\Leftrightarrow \)PT Vô Nghiêm