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已知;m2+m-1=0 求m3+2m2+1997值
m后面为几次方
人气:375 ℃ 时间:2020-05-19 20:30:19
解答
m2+m-1=0
=>m^2+m=1
m3+2m2+1997
=(m^3+m^2)+m^2+1997
=m(m^2+m)+m^2+1997
=m+m^2+1997
=1+1997
=1998
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