∵a2+a=2,
∴2a2+2a+2009=2(a2+a)+2009,
=2×2+2009,
=4+2009,
=2013.
若a2+a=2,求2a2+2a+2009的值.
若a2+a=2,求2a2+2a+2009的值.
數(shù)學(xué)人氣:191 ℃時(shí)間:2020-06-13 07:17:20
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