1.如图所示,△BOD、△COE、△BOC的面积分别为2、3、4,则△ABC的面积为_________.2.已知抛物线C:y=-x²+ax+b的顶点为D,它与x轴相较于原点两侧的两点A(x1,0)和B(x2,0)【其中x1<x2】,且a、b是关于x
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![1.如图所示,△BOD、△COE、△BOC的面积分别为2、3、4,则△ABC的面积为_________.2.已知抛物线C:y=-x²+ax+b的顶点为D,它与x轴相较于原点两侧的两点A(x1,0)和B(x2,0)【其中x1<x2】,且a、b是关于x](/uploads/image/z/2654831-47-1.jpg?t=1.%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E2%96%B3BOD%E3%80%81%E2%96%B3COE%E3%80%81%E2%96%B3BOC%E7%9A%84%E9%9D%A2%E7%A7%AF%E5%88%86%E5%88%AB%E4%B8%BA2%E3%80%813%E3%80%814%2C%E5%88%99%E2%96%B3ABC%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA_________.2.%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFC%3Ay%3D-x%26%23178%3B%2Bax%2Bb%E7%9A%84%E9%A1%B6%E7%82%B9%E4%B8%BAD%2C%E5%AE%83%E4%B8%8Ex%E8%BD%B4%E7%9B%B8%E8%BE%83%E4%BA%8E%E5%8E%9F%E7%82%B9%E4%B8%A4%E4%BE%A7%E7%9A%84%E4%B8%A4%E7%82%B9A%EF%BC%88x1%2C0%EF%BC%89%E5%92%8CB%EF%BC%88x2%2C0%EF%BC%89%E3%80%90%E5%85%B6%E4%B8%ADx1%EF%BC%9Cx2%E3%80%91%2C%E4%B8%94a%E3%80%81b%E6%98%AF%E5%85%B3%E4%BA%8Ex)
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