圖片參考：http://img257.imageshack.us/img257/5885/img201.jpg
圖片參考：http://img689.imageshack.us/img689/6479/img202e.jpg
圖片參考：http://img143.imageshack.us/img143/3073/img203m.jpg
圖片參考：http://img248.imageshack.us/img248/465/img204e.jpg
thx a lot~~~~~
更新1:
sorry,the ans of no.4 is 4
更新2:
你漏左question 3 & question 4 (inequalities)既ans係4
