若(m+1)^-1/3
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![若(m+1)^-1/3](/uploads/image/z/6928807-31-7.jpg?t=%E8%8B%A5%28m%2B1%29%5E-1%2F3)
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若(m+1)^-1/3
若(m+1)^-1/3
若(m+1)^-1/3
m+1>1-2m,m+1≠0 1-2m≠0
∴m>0但m≠1/2
等价于:1/三次根号(m+1)<1/三次根号(1-2m),
等价于:1/(m+1)<1/(1-2m),
[(1-2m)-(m+1)]/[(m+1)(1-2m)]<0
-3m/[(m+1)(1-2m)]<0,
等价于:m(m+1)(1-2m)>0,
解得:m>1/2或0