王刚从家去学校,每分走60米,15分可以走到学校.如果每分走75米,几分可以走到学校?(用比例解)
12分可以走到学校
—This history book is of great value.
—Exactly. _____ can be enjoyed from it ______ you have a deep understanding of it, however.
一物体从高处自由下落,经2秒落地,则该物体下落1秒时,离地高度是( )