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如图,抛物线y=﹣x2+bx+c与x轴交于A、B两点,与y轴交于C.直线y=x+3经过点A、C. (1)求抛物线的解析式; (2)P是抛物线上一动点,过P作PM∥y轴交直线AC于点M,设点P的横...
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