题目
题型:四川省中考真题难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143200-60599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143200-32082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143200-79481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143200-43172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143200-88713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143201-43735.png)
(1)已知需加固的大坝长为150米,求需要填土石方多少立方米?
(2)求加固后的大坝背水坡面
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143201-79530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143201-84609.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143202-28249.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143202-55896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143202-96959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143202-71893.png)
则∵Rt△ABM中
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143203-56109.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143203-47752.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143203-70859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143203-51126.png)
又∵需加固的大坝长为150米,
∴需要填土石方为
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143204-30304.png)
(2)∵Rt△DCN中
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143204-55481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143204-76273.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143204-77442.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143205-76096.png)
∴Rt△DNE中
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143205-47635.png)
答:(1)已知需加固的大坝长为150米,求需要填土石方
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143205-93307.png)
(2)加固后的大坝背水坡面
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143205-14604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143206-52454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143206-92304.png)
核心考点
试题【水利部门为加强防汛工作,决定对某水库大坝进行加固,大坝的横截面是梯形.如图9所示,已知迎水坡面AB的长为16米,背水坡面的长为米,加固后大坝的横截面积为梯形的长】;主要考察你对解三角形等知识点的理解。[详细]
举一反三
(1)求m的值;
(2)点P(0,t)是线段OB上的一个动点(点P不与0,B两点重合),过点P作x轴的平行线,分别交AB,OC,DC于点E,F,G,设线段EG的长为d,求d与t之间的函数关系式(直接写出自变量t的取值范围);
(3)在(2)的条件下,点H是线段OB上一点,连接BG交OC于点M,当以OG为直径的圆经过点M时,恰好使∠BFH=∠ABO,求此时t的值及点H的坐标.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143145-41742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143133-94908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143134-12121.png)
B.(12
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143134-56598.png)
C.(4
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143134-95561.png)
D.4
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143134-62760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143129-30844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143129-21072.png)
B.100
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143129-67125.png)
C.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143130-60026.png)
D.
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143130-29793.png)
(1)求此时另一端A离地面的距离(精确到0.1m);
(2)若跷动AB,使端点A碰到地面,请画出点A运动的路线(不写画法,保留画图痕迹),并求出点A运动路线的长.(参考数据:sin15°≈0.26,cos15°≈0.97,tan15°≈0.27)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143124-69662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143117-59446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143118-25201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104143118-58140.png)
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