حاصل عبارت ${{\mathop x\nolimits^2 - 3x + 2} \over {\mathop x\nolimits^2 - 2x}} \div {{\mathop x\nolimits^2 + x - 2} \over {\mathop {2x}\nolimits^2 + 4x}}$ کدام است؟
2
2 )
${{2x + 2} \over {x - 1}}$
3 )
${x \over 2}$
4 )
${{x + 2} \over {x - 2}}$