a: =>x+3=0 hoặc x-5=0
=>x=5 hoặc x=-3
c: =>x+2/3=0 hoặc x-1/2=0
=>x=1/2 hoặc x=-2/3
e: \(\Leftrightarrow\left[{}\begin{matrix}3x-1=0\\2x-3=0\\x+5=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{1}{3}\\x=\dfrac{3}{2}\\x=-5\end{matrix}\right.\)
`(x+3)(x-5)=0`
`Th1`
`x+3=0`
`=>x=0-3`
`=>x=-3`
`Th2`
`x-5=0`
`=>x=0+5`
`=>x=5`
`c)`
`(x+2/3)(x-1/2)=0`
`Th1`
`x+2/3=0`
`=>x=0-2/3`
`=>x=-2/3`
`Th2`
`x-1/2=0`
`=>x=0+1/2`
`=>x=1/2`
`e)`
`(3x-1)(2x-3)(x+5)=0`
`Th1`
`3x-1=0`
`=>3x=0+1`
`=>3x=1`
`=>x=1:3`
`=>x=1/3`
`Th2`
`2x-3=0`
`=>2x=0+3`
`=>2x=3`
`=>x=3/2`
`Th3`
`x+5=0`
`=>x=0-5`
`=>x=-5`
