Ò»¡¢Ñ¡ÔñÌ⣺±¾´óÌâ¹²12СÌ⣬ÿСÌâ5·Ö£¬¹²60·Ö.ÔÚÿСÌâ¸ø³öµÄËĸöÑ¡ÏîÖУ¬Ö»ÓÐÒ»ÏîÊÇ·ûºÏÌâÄ¿ÒªÇóµÄ¡£
1.ÈôÃüÌâp£º∀x∈R,2x2£«1>0£¬Ôò pÊÇ(¡¡¡¡)
A£®∀x∈R,2x2£«1≤0 B£®∃x∈R,2x2£«1>0
C£®∃x∈R,2x2£«1<0 D£®∃x∈R,2x2£«1≤0
2. ÔÚ¡÷ABCÖУ¬“A>60°”ÊÇ “ ”µÄ£¨¡¡¡¡¡¡£©
A£®³ä·Ö²»±ØÒªÌõ¼þ B£®±ØÒª²»³ä·ÖÌõ¼þ
C£®³äÒªÌõ¼þ D£®¼È²»³ä·ÖÒ²²»±ØÒªÌõ¼þ
3. ͳ¼ÆijУ1 0