若m²+m-1=0 则,m³+2m²+3等于

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若m²+m-1=0则,m³+2m²+3等于若m²+m-1=0则,m³+2m²+3等于若m²+m-1=0则,m³+2m&#

若m²+m-1=0 则,m³+2m²+3等于
若m²+m-1=0 则,m³+2m²+3等于

若m²+m-1=0 则,m³+2m²+3等于
由 m^2+m-1=0 得
m^2+m=1
那么 m^3+2*m^2+3
=m*(m^2+m)+m^2+3
=m^2+m+3
=1+3
=4