Question

Answer 1

\(a,5x-15=3x-7\\ \Leftrightarrow5x-3x=-7+15\\ \Leftrightarrow2x=8\\ \Leftrightarrow x=4\)

\(b,\dfrac{2x+3}{3}-1=\dfrac{x-4}{2}\\ \Leftrightarrow\dfrac{2\left(2x+3\right)}{6}-\dfrac{6}{6}-\dfrac{3\left(x-4\right)}{6}=0\\ \Leftrightarrow4x+6-6-3x+12=0\\ \Leftrightarrow x+12=0\\ \Leftrightarrow x=-12\)

\(c,\left(2x+3\right)\left(3x-5\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}2x+3=0\\3x-5=0\end{matrix}\right.\\ \Leftrightarrow\left[{}\begin{matrix}x=-\dfrac{3}{2}\\x=\dfrac{5}{3}\end{matrix}\right.\)

 

Answer 2

đêm rồi chắc là k ai trả lời đâu mai bạn đăng sau cũng đc