solve each inequality and express answers in interval notati
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solve each inequality and express answers in interval notation.
x^2+5x+6
------------->=0
1-x^2
x^2+5x+6
------------->=0
1-x^2
分子因式分解为(x+2)(x+3),分子因式分解为(1-x)(1+x)
该不等式等同于:(x+2)(x+3)(1-x)(1+x)≥0,且x≠±1
解得:-3≤x≤-2,或者-1<x<1
该不等式等同于:(x+2)(x+3)(1-x)(1+x)≥0,且x≠±1
解得:-3≤x≤-2,或者-1<x<1
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