A:can't
B:mustn't
C:needn’t
D:won’t
已知O为坐标原点,△AOB中,边OA所在的直线方程是y=3x,边AB所在的直线方程是y=﹣12x+7,且顶点B的横坐标为6.
(1)求△AOB中,与边AB平行的中位线所在直线的方程;
(2)求△AOB的面积;
(3)已知OB上有点D,满足△AOD与△ABD的面积比为2,求AD所在的直线方程.
— ______ is this shirt?
— It's ninety-nine yuan. ( )
I like ________ story books, but my friend Alice likes ________ TV shows.