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Algebraic proofs
ronniebelle
Jan 18, 2010, 12:55 PM
Prove that
Ad+bc<ac+bd
Given a<b
Given c<d
ebaines
Jan 18, 2010, 01:03 PM
Let b = a+\delta and d = c+\Delta . Then sub these into ad + because and ac + bd, and see how the two compare.