设m²+m-1=0,则m³+2m²+1997=
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![设m²+m-1=0,则m³+2m²+1997=](/uploads/image/z/10405469-29-9.jpg?t=%E8%AE%BEm%26%23178%3B%2Bm-1%3D0%2C%E5%88%99m%26%23179%3B%2B2m%26%23178%3B%2B1997%3D)
设m²+m-1=0,则m³+2m²+1997=
设m²+m-1=0,则m³+2m²+1997=
设m²+m-1=0,则m³+2m²+1997=
m²+m-1=0
m³+m²=m
m³+2m²+1997
m³+m²+m²+1997
=m²+m+1997
=1998
.1998!下面公式提取个m的平方乘以m+2 由一公式可以得出m的平方等于1-m,带入下面的公式,然后你可以得到一个-(m^2+m-2)+1997,根据一公式就行了!!