题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165335-33748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165335-20506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165335-17931.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165335-33748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165335-99209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165335-85867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165336-47615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165336-12578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165336-26155.png)
A.![]() | B.![]() | C.3 | D.![]() |
答案
解析
∵点B与D关于AC对称,
∴PD=PB,
∴PD+PE=PB+PE=BE最小.
即P在AC与BE的交点上时,PD+PE最小,为BE的长度;
∵正方形ABCD的面积为12,
∴AB=2
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165337-86546.png)
又∵△ABE是等边三角形,
∴BE=AB=2
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165337-86546.png)
故所求最小值为2
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165337-86546.png)
故答案为A
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165207-19998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165207-26671.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165207-95833.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165208-27983.png)
(1)求证:CM⊥DM;
(2)求点M到CD边的距离.(用含
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165207-19998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165207-26671.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029165208-60729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164941-13146.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164941-44236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164941-85264.png)
(1)在图1中画出一腰长为
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164941-73217.png)
(2)在图2中画出一底边长为
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164941-73217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164920-64628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164920-86870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164921-61713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164921-78691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164921-24029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164921-32530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164922-71599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164922-70708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164922-25841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164922-48325.png)
(1)如图1,连接
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164922-20499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-80719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-96897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164922-20499.png)
(2)如图2,动点
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-15256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-29143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-26606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-41682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-69140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-97253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-15256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-26606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164922-25841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164925-95932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-26606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-29143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-41682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164925-59853.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164922-70708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-41682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-15256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164925-92435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-29143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164925-92435.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164925-74110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-26606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164924-41682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-15256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164923-29143.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164925-74110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164925-19526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164251-14549.png)
A.12cm2 | B.24cm2 | C.36cm2 | D.48cm2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191029/20191029164117-51927.png)
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