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Lay15
@Lay15
April 2020
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Se [ x - y ]² - [ x+y ]
² = 20 então calcule x*y ?
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deboraandradevz
X² - 2xy + y² - ( x² + 2xy + y²) = 20
x² - 2xy +y² - x² - 2xy - y² = 20
-2xy - 2xy = 20
-4xy = 20
xy = - 5
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x² - 2xy +y² - x² - 2xy - y² = 20
-2xy - 2xy = 20
-4xy = 20
xy = - 5