This kind of glasses manufactured by experienced craftsmen ______comfortably.
This kind of glasses manufactured by experienced craftsmen ______comfortably.
Betty doesn`t have enough money to buy that coat. It`s very ___. The price is too_____.
It`s bad manners to laugh _____others when they are _____ trouble.
Has your teacher given you any advice______ your study?
某公司计划购进一批原料加工销售,已知该原料的进价为6.2万元/t,加工过程中原料的质量有20%的损耗,加工费m(万元)与原料的质量x(t)之间的关系为m=50+0.2x,销售价y(万元/t)与原料的质量x(t)之间的关系如图所示.
(1)求y与x之间的函数关系式;
(2)设销售收入为P(万元),求P与x之间的函数关系式;
(3)原料的质量x为多少吨时,所获销售利润最大,最大销售利润是多少万元?(销售利润=销售收入﹣总支出).
There is ____ interesting ____today`s newspaper.
如图,四边形ABCD内接于⊙O,AB为⊙O的直径,过点C作CE⊥AD交AD的延长线于点E,延长EC,AB交于点F,∠ECD=∠BCF.
(1)求证:CE为⊙O的切线;
(2)若DE=1,CD=3,求⊙O的半径.
Did John hit Bob _____eye ?
如图,山坡上有一棵竖直的树AB,坡面上点D处放置高度为1.6m的测倾器CD,测倾器的顶部C与树底部B恰好在同一水平线上(即BC//MN),此时测得树顶部A的仰角为50°.已知山坡的坡度i=1∶3(即坡面上点B处的铅直高度BN与水平宽度MN的比),求树AB的高度(结果精确到0.1m.参考数据:sin50°≈0.77,cos50°≈0.64,tan50°≈1.19)
小江与小杰两名同学为学校图书馆清点一批图书,小江清点完600本图书比小杰清点完540本图书少用了5min.已知小江平均每分钟清点图书的数量是小杰的1.25倍,求两名同学平均每分钟清点图书各多少本.