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m&

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___.
m²+m-1=0 m²+m=0
m³+2m²+3
=m（m²+2m）+3
=m（m²+m+m）+3
=m（1+m）+3
=m+m²+3
=1+3
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