如图,直线y=1/2x+2与y轴交于点A,与x轴交于点D,抛物线y=1/2x2+bx+c与直线交于点A,E两点,若B(1,0)(1)求抛物线的函数解析式(2)点P是直线AE上一个动点,当△PBC周长最短时,求点P的坐标(3)若Q是x

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