九年级的一元二次方程应用题、请写出过程.1.关于x的一元二次方程x²-mx+2m-1的两个实数根分别是x1、x2,且x1²+x2²=7,则(x1-x2)²的值是多少?2.2009年4月7日,国务院公布了《医药卫生体

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