如图,抛物线y=1/2x²+bx+c与y轴交于点C(0,-4),与 x轴交于点A,B且B点坐标为如图, 抛物线y=1/2x²+bx+c与y轴交于点C(0,-4),与 x轴交于点A,B且B点坐标为(2,0)(1)求抛物线解析式.求得y=1/2x ²+x-4.(2
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