中4maths ch6 B (8(14)(18) 6C (5)(7)(21)
[IMG]http://i164.photobucket.com/albums/u4/ming21ki/IMG_0011-7.jpg[/IMG]
[IMG]http://i164.photobucket.com/albums/u4/ming21ki/IMG_0010-11.jpg[/IMG]
[IMG]http://i164.photobucket.com/albums/u4/ming21ki/IMG_0012-7.jpg[/IMG]
[IMG]http://i164.photobucket.com/albums/u4/ming21ki/IMG_0013-7.jpg[/IMG]