
1个回答
展开全部
x² - x - 1 = 0
x² - x = 1
-x³ + 2x² + 2009
= (-x³ + x²) + x² + 2009
= -x(x² - x) + x² + 2009
= -x + x² + 2009
= 1 + 2009
= 2010
x² - x = 1
-x³ + 2x² + 2009
= (-x³ + x²) + x² + 2009
= -x(x² - x) + x² + 2009
= -x + x² + 2009
= 1 + 2009
= 2010
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询