若m²+m-1=0,则m³+2m²+3的值为___.
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若m²+m-1=0,则m³+2m²+3的值为___.
若m²+m-1=0,则m³+2m²+3的值为___.
若m²+m-1=0,则m³+2m²+3的值为___.
M的平方+m-1=0
m的平方+m+(1/2)的平方-+(1/2)的平方=0
(m+1/2)的平方=5/4
可得m=根号5/2-1/2或者m=-根号5/2-1/2.
将以上两个根分别代入m³+2m²+3得出就行啦.