math inequalities

2011-04-10 2:43 am

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Please show steps clearly.
更新1:

(2x+1)(2x-3)=4x^2-4x-3, not=4x^2-4x+3

回答 (1)

2011-04-10 3:35 am
✔ 最佳答案

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http://i.imgur.com/RGnm9.gif

2011-04-09 23:28:23 補充:
更改:
http://i.imgur.com/t8ABF.gif


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