题目

某水果批发商销售每箱进价为40元的苹果，假设每箱售价不得低于50元且不得高于55元。市场调查发现，若每箱以50元的价格销售，平均每天销售90箱，价格每提高1元，平均每天少销售3箱。 （1）求平均每天的销售量（箱）与销售单价 （元/箱）之间的函数解析式； （2）求该批发商平均每天的销售利润（元）与销售单价 （元/箱）之间的函数解析式； （3）当每箱苹果的售价为多少元时，可以获得最大利润？最大利润是多少？Sunny English Club        For students16:00 – 18:00 Every Saturday   200 Yuan a month     9 Zhou Yu Street    Tel: 3785290Foreign teachers, English songs and films and more!Ocean Museum       9:00—17:00 From Thursday to Sunday     Ticket: 50 yuan132 Xue Yuan Street    Tel: 5439871       Show you a full picture of sea lives!Health Centre       9:00—17:30      16 Yong Le Street      Tel: 3801451Free examinations for those over 70.     Give you good advice to keep healthy!小题1:Sunny English Club is for _______. A．nursesB．policemenC．businessmenD．students小题2:You will pay ________ if you want to stay in the English club for half a year.A．300 yuanB．600 yuanC．1200 yuanD．2400 yuan小题3:You can visit Ocean Museum ________. A．on SaturdayB．on WednesdayC．on MondayD．anytime小题4:One can get free exams in Health Centre if he is ________. A．9B．17C．67D．73小题5:If you are interested in the life of fish, you should go to________. A．Health CentreB．Ocean Museum C．Sunny English ClubD．16 Yong Le Street