Education.

a=b
a²=ab
a²-b²=ab-b²
(a-b)(a+b)=b(a-b)
a+b= b
a+a=a
2a=a
2=1

lolx..rey happen to sh0w mi this..
budden somhow i dunt think it make sense..
math pr0..plz com see see...
ask guan jie c0m~~
guan jie!!!!!