2.3^n+1/27^n
3.In the figure,ABC,AFE,BDE and FDC are straight lines.
(A)prove that triangle AEB ~triangle ACF
(B)find the length of FE
http://img693.imageshack.us/img693/9143/rgrk.png
4.ABCD is //gram.The angle bisectors of angel BCD and angle ADC interests at E.
(A)prove that x+y=90°
(B)find angle DEC
http://img717.imageshack.us/img717/7626/62911640.png
5.AEB,AFC and AGD are straight lines.
(A)prove that FG//CD
(B)find angle CAD
http://img30.imageshack.us/img30/7785/5t5t5.png
更新1:
快D 呀~唔該！！
更新2:
快D答啦！！THX
更新3:
thx~~~~~~~~~~~~~~~~~~~萬分感激!!!!!
更新4:
没畫少呀！看唔到你張圖呀
更新5:
看到啦~THX！
