Q2. http://us.f6.yahoofs.com/hkblog/rDkOb8SWERnmmaR4UeTpiIbmgvVT_1/blog/20100317045858950.jpg?ib_____D0.4ihqdi
每條都要解釋!!!
更新1:
點解要[ (2.5 - 1.5) / 5 ] L 點解要除5???
更新2:
第二題[ (2.5 - 1.5) / 5 ] L 點解要除5???