已知二次函数y=x2﹣2(m+1)x+m2+5=0的图像过(a,0)和(b,0).
(1)若(a﹣1)(b﹣1)=28,求m的值;
(2)已知等腰△ABC一边长为7,若a、b旳值恰好是△ABC另外两边的边长,求这个三角形的周长.
(1)若(a﹣1)(b﹣1)=28,求m的值;
(2)已知等腰△ABC一边长为7,若a、b旳值恰好是△ABC另外两边的边长,求这个三角形的周长.
更新时间:2016-12-05 23:28:01
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【知识点】 线段周长问题(二次函数综合)
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解答题-应用题
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适中
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【推荐1】抛物线
与
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在点
左侧),与
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(1)如图1,当
时,连接
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的形状,并求
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(2)如图2,当
时,点
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轴于
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(1)如图1,当
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(2)如图2,当
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解答题-问答题
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适中
(0.65)
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(2)连接
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作
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,连接
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