Same question .

Thank you very much!

May I have it? My email is: jennychi.jc@gmail.com Thank you very much!

64 x 66 = (65-1) x (65+1)=65 x 65 -1

Thanks.

Do you know a little bit chinese? I can give you a website that it is only chinese' pronounciation there. You can download the textbook 《中文》 from V.1 to V.12, as well as the exercise books accompanied. The textbooks are used in a lot of chinese school for children who want to learn chinese oversea. http://www.hwjyw.com/textbook/dzjc/huawen.htm If you have any question, please ask me.