x属于(负无穷大,-5】直线,2,-54, 25属于,真包含于,= ,不属于二次,y轴-1 ,8,3 向下,高,大3,-5,-2,向上,低,小sina=3/5 cosa=4/5 tana=3/4 ctga=4/39,9,51,201+-4 +-8