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Evaluate 400/(400^2-(380)(420))without using a calculator.

Guest Mar 16, 2017
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 #1
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Nvm I know how to do liao

Guest Mar 16, 2017
 #2
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(400)/ [(400^2 - (400-20)(400+20) ] =

400(400^2 -400^2 +20^2) =

400/(20^2)

400/400 = 1     No calculator required !

ElectricPavlov  Mar 16, 2017

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