(a+b)²等於咩?
thz for your answer!!!!
(a+b)²等於咩???? 急!
2008-03-12 12:34 am
回答 (2)
2008-03-12 12:35 am
(a+b)²
= (a+b) * (a+b)
= a*a + a*b + b*a + b*b
=a² + 2ab + b²#
= (a+b) * (a+b)
= a*a + a*b + b*a + b*b
=a² + 2ab + b²#
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