题目

已知关于x的一元二次方程+(2m-1)x+=0有两个实数根和. (1)求实数m的取值范围; (2)当时,求m的值 答案: (1)实数m的取值范围是m≤.  (2)m=Discovering consists of seeing what everybody has seen and      what nobody has thought.        A.think B.thinking    C.thought     D.to think
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