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Maths

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sbp113450carman

2008-1-13 17:18

# 1

(x+5)(x-5)=？

轟龍

2008-1-20 10:55

# 2

2
x -25

假訪客

2008-3-14 04:17

# 3

x^2 - 25

by
(x+y)(x-y) = x^2 - y^2

^ <---指數

andy135

2008-6-13 13:49

# 4

公式:
(a+b)(a-b)=a平方-b平方

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