حاصل تقسیم چندجملهای ${9\mathop a\nolimits^3 \mathop b\nolimits^4 + 8\mathop a\nolimits^5 \mathop b\nolimits^2 - 12\mathop a\nolimits^3 b}$بر ${4\mathop a\nolimits^2 b}$ کدام است؟
${{9\mathop {ab}\nolimits^3 } \over 4} + 2\mathop a\nolimits^3 b - 3a$
2 )
${{9\mathop {ab}\nolimits^3 } \over 3} + 2\mathop a\nolimits^3 b +2a$
3 )
${{9\mathop {ab}\nolimits^4 } \over 3} + 2\mathop a\nolimits^2 b - 3a$
4 )
${{9\mathop {ab}\nolimits^5 } \over 4} + 3\mathop a\nolimits^3 b + 3a$