My father ofther helps people in his work.(对 helps peoplet提问 )

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• My father your ofent helps people in his work 就划线部分提问
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• My father ofther helps people in his work.(对 helps peoplet提问 )
• 已知关于x的一元二次方程x2+mx+n=0的两个实数根分别为x1=-1，x2=2，则二次函数y=x2+mx+n中，当y＜0时，x的取值范围是______．
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