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Maths
雅虎贊助網站載入中...
sbp113450carman
2008-1-13 17:16
# 1
(x+5)(x-5)=？
引用
peterfish99
2008-6-15 13:19
# 2
=x^2-5x+5x-25
=x^2-25
=x^2-5^2
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