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49. ÈôaX2+bX+12¿É·Ö½â³É (2X+3)(7X+4)£¬Ôò a¡¢bµÄÖµÊÇʲô

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53. Èô10¦Ö2 - 4¦Ö -14¿É·Ö½â³É(2¦Ö + a)(5¦Ö - 7)£¬ÔòaµÄֵӦΪʲô

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56. 4¡¢6¡¢8¡¢9¡¢10µÄÒòÊýÊÇʲô? ËûÃǵÄÒòÊýÓÐʲô¹²Í¬µã

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