一个直角三角形中,最大角和一个锐角度数之比为5:4,另一个锐角是____度。
①____;②____;③____;④____.
如图,在平面直角坐标系中,直线y=﹣x+4与x轴、y轴分别交于点A、B.抛物线y=﹣ 13(x−m)2 +n的顶点P在直线y=﹣x+4上,与y轴交于点C(点P、C不与点B重合),以BC为边作矩形BCDE,且CD=2,点P、D在y轴的同侧.
— What do you think of tomorrow's football match? — _______ difficult for us _______ the match.