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April 17, 2014

April 17, 2014

Posted by **christina** on Monday, June 20, 2011 at 12:36pm.

- maths -
**Henry**, Monday, June 20, 2011 at 5:32pm(ab + bd) + (ac + cd).

b(a + d) + c(a + d),

(a + d)(b + c).

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