文案分析综合sajc 2010 jc1 chapter 0909.pdfVIP

SAJC2010JC1H2Mathematics

LectureNotes

Chapter9:BinomialExpansion(Teachers’copy)

IntheO-Levelsyllabus,wehaveseenthebinomialexpansionforthefollowingexpression.

nnnn

n

nn1n222n2n1n

abaabab...ababb



12n2n1



n

n!

whereandn

rr!nr!



Note:Justincaseyouhaveforgotten,let’srefreshbyexpandingthefollowing

444!34!224!34

32x332x32x32x2x



1!3!2!2!3!1!

234

xxxx

812162169616

9.1Howtoexpand