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).
---The sports shoes must be Linda’s.
---No,they_____be.They’re too small forher.
---What are the people in Korea supposed to do when they meet for the first time?
---They are supposed to_______.
---______do you go hiking?
---Once a week.
---_____did you tell him about the news?
---By____ane-mail.
---Wouldyoumind______yourbike?
--No,not at all.I’l lput it under the tree right away.
---Couldyoutellme_____?
---Becauseshelikesherstudentsverymuch.
---_____you_____outtheproblem,Sam?
---Notyet,butI’m going to.
---Someoftheplasticbagscan’t______afterJune1.
---Yes,peoplewilluseenvironmentalbagsinstead.
---Alltheclerkswenthome_____Mr.Wang.Why?
---Becausehehadtofinishhiswork.
---Can you_____your little brother?I’mbusynow.
---OK.I’ll do it right now.