手机专卖店在5月5日这一天，某品牌的手机十分畅销，上午卖出75部，下午卖出100部，已知每部手机a元，这一天一共卖出__

Dear Sir or Madam,
I am writing to make a complaint against your bad delivery service.
I’m afraid that the enclosed CD player doesn’t work.It is the third one I’ve got to return this month.
Other than the three I’ve had to return recently,I’ve always found your products to be excellent.I would be grateful if you could send a replacement and refund my postage.
I look forward to your reply and proper resolution of my problem,and will until the end of this week before seeking help from a consumer protection agency or the Better Business Bureau.Please contact me by the address on the envelope or by phone at 6668888.
Sincerely,
Wang Hua

Dear Sir
I bought the new cellphone from your company
in march and found that I can not use it after a week.So I go to repace it while two time repeace it also can't use.
Would you please check the cellphone and replace a new one for us or get a refound for this.
I hope you could deal with it as soon as possible.Your prompt reply will be highly appreciated
Sincereiy yours

1部15元
所以x部是15x元
再加上基本工资
所以y=400+15x
其中x是自然数

一共=70÷（1/3+1/4）=120部
剩=120-70=50部

我跟你说 我专升本考试英语作文就是给顾客写道歉信 因为延误手机修理时间了.我滴个乖乖 姐的英语都丢到爪哇国了 写这个要了我半条命

解题思路：（1）如图是折线统计图；
（2）求出前三个季度的总销售的量再除以9个月份，就是每月平均销售收入多少元；
（3）用第三季度的销售收入减去第一季度销售收入得到的差再除以第一季度销售收入即可；
（4）把数值看作整百数进行估算即可．

（1）如图是折线统计图；

（2）（400+450+690）÷9
=1540÷9
≈171.1（万元）；
答：前三季度平均每月销售收入是171.1万元．

（3）（690-400）÷400
=290÷400
=72.5%；
答：第三季度比第一季度增收72.5%．

（4）400+450+690+650
≈400+500+700+700
=2300（万元）；
答：预测这个专卖店今年销售收入会达到2300万元．
故答案为：折线，171.1，72.5，2300．

点评：
本题考点： 单式折线统计图；从统计图表中获取信息．

考点点评： 本题考查了统计图的运用，考查了学生观察，分析，解决问题的能力．

Jun 17th,2012
Dear Sir/Madam,
I'm writing to complain about the recent purchase of a new style cellphone from your department store on early May this year.Unfortunately,the phone was break down with less than a week use.I have been twice repaired for it,but still nothing worked.So I require that whether you will give me a replacement or my refund.I will be much appreciated.
Yours Sincerely
Jenny Wang

Dear xxx,
I bought one xxx mobile phone from your site on June 1st.And you promised that the phone was the best in your shop with the latest functions.You also guaranteed that it had one year warranty.But you know what?The phone didn't work one week later without any damages.
I don't want to complain too much here.What I want is a new replacement.
Wait for your quick and proper response.
Thanks and regards,
xxx

二周比第一周多卖的手机数量=500X10%X80%=40部.

解题思路：先用加法计算出一天一共卖出的手机数量，再乘单价即可计算出总价；
用减法计算出上午比下午少卖出的手机数量，再乘单价即可．

一共卖出：（100+75）×a=175a（元）；
上午比下午少卖出：（100-75）×a=25a（元）．
答：这一天一共卖出175a元，上午比下午少卖25a元．
故答案为：175a，25a．

点评：
本题考点： 用字母表示数．

考点点评： 解决本题关键是找出数量关系，再解答．