解不等式(x+2)*(1-x)*(1+x²)>0和x²-(a²+a)x+a²大于等于0 a∈R
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解不等式(x+2)*(1-x)*(1+x²)>0和x²-(a²+a)x+a²大于等于0 a∈R
解不等式(x+2)*(1-x)*(1+x²)>0和x²-(a²+a)x+a²大于等于0 a∈R
解不等式(x+2)*(1-x)*(1+x²)>0和x²-(a²+a)x+a²大于等于0 a∈R
(x+2)*(1-x)*(1+x²)>0
因为(1+x²)>0所以(x+2)*(1-x)>0
那么(x+2)*(x-1)