探究不同裁剪方式的面积大小问题 | |
素材1 | 现有一批斜边长为![]() ![]() ![]() |
素材2 | 按图2和图3的方式,正方形的顶点都在等腰三角形的边上,分别裁出一块正方形.![]() |
素材3 | 因生产的需要,对材料的裁剪按如下步骤:如图4 步骤1:在等腰直角 ![]() ![]() ![]() ![]() ![]() 步骤2:取其中一块零料 ![]() ![]() ![]() |
问题解决 | |
任务1 | 按图2和图3裁出的正方形,试比较裁出的两种正方形的面积大小,通过计算说明. |
任务2 | 在图4中,设裁下的正方形![]() ![]() |
任务3 | 按图4的裁剪方法,裁出的长方形和正方形的面积和可以做到和图2的裁出的正方形面积相等吗?通过计算说明. |
更新时间:2024-03-29 13:55:55
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【推荐1】如图,某中学准备在校园里利用院墙的一段,再砌三面墙,围成一个矩形花园ABCD,已知院墙MN长为25米,篱笆长50米(篱笆全部用完),设篱笆的一面AB的长为x米.
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(2)若围成的矩形ABCD的面积为S平方米,当x为何值时,S有最大值,最大值是多少?
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【推荐2】如图,把一边长为
的正方形硬纸板的四角各剪去一个同样大小的正方形,将剩余部分折成一个无盖的盒子.
,那么剪掉的正方形边长为多少?
(2)折成的长方形盒子的侧面积是否有最大值?如果有,求出这个最大值和此时剪掉的正方形边长;如果没有,说明理由.
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(2)折成的长方形盒子的侧面积是否有最大值?如果有,求出这个最大值和此时剪掉的正方形边长;如果没有,说明理由.
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解答题-证明题
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【推荐1】如图,在
中,
,
,点
在线段
上,
,
平分
交
于
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.
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(1)求证:
是等腰直角三角形;
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,求
的长.
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【推荐2】综合与探究
如图,抛物线
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,当
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如图,抛物线
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(1)求点A,B和C的坐标;
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(1)如图1,当点
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(2)如图2,当点
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(3)在点
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