jie yi xia yi yuan san ci fang chengn3-n=?da cuo le,ying gai shi :n3-n=2,qiu n de zhi

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jie yi xia yi yuan san ci fang chengn3-n=?da cuo le,ying gai shi :n3-n=2,qiu n de zhi

jie yi xia yi yuan san ci fang chengn3-n=?da cuo le,ying gai shi :n3-n=2,qiu n de zhi
jie yi xia yi yuan san ci fang cheng
n3-n=?
da cuo le,ying gai shi :
n3-n=2,qiu n de zhi

jie yi xia yi yuan san ci fang chengn3-n=?da cuo le,ying gai shi :n3-n=2,qiu n de zhi
有个公式:n3-1=(n-1)*(n2+n+1)
所以原等式可转化为:n3-1=n-1
所以(n-1)*(n2+n+1)=n-1
所以n2+n+1=1
所以n2+n=0
所以n(n+1)=0
所以 n=0或者-1
(检验略)