设m²+m-1=0,求m³+2m²+3的值

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/04/29 05:21:41

您好：

m²+m-1=0
m²+m=1

m³+2m²+3
=m³+m²+m²+3
=m（m²+m）+m²+3
=m+m²+3
=1+3
=4

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