>
数学
>
x
2
-x-1=0,则2x
3
+7x
2
-11x+2012=______.
人气:454 ℃ 时间:2020-04-15 22:02:42
解答
∵x
2
-x-1=0,
∴x
2
-x=1,
∴2x
3
+7x
2
-11x+2012
=2x(x
2
-x)+9x
2
-11x+2012
=9x
2
-9x+2012
=9(x
2
-x)+2012
=9+2012
=2021.
故答案是:2021.
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