依题意得: x60+2(x+15)
如图,滑雪场有一坡角α为20°的滑雪道,滑雪道AC的长为200米,则滑雪道的坡顶到坡底垂直高度AB的长为( )
读一读,涂一涂。It's black.____
There is with my watch.