勾股定理的应用题 初二数学勾股定理难一点的应用题,要有答案。谢谢。

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26\uff0e\u5982\u56fe\uff0c\u4e00\u4e2a\u957f\u4e3a5m\u7684\u68af\u5b50\u659c\u9760\u5728\u5899\u4e0a\uff0c\u68af\u5b50\u7684\u5e95\u7aef\u8ddd\u58994m\uff0e
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\uff083\uff09\u82e5\u4f7f\u68af\u5b50\u7684\u9876\u7aef\u8ddd\u5730\u97624.8m\uff0c\u6b64\u65f6\u5e94\u5c06\u68af\u5b50\u518d\u5411\u5899\u63a8\u8fdb\u591a\u5c11\u7c73\uff1f
27\uff0e\u5728\u4e00\u5e73\u76f4\u6cb3\u5cb8l\u7684\u540c\u4fa7\u6709A\uff0cB\u4e24\u4e2a\u6751\u5e84\uff0cA\uff0cB\u5230l\u7684\u8ddd\u79bbAM\uff0cBN\u5206\u522b\u662f3km\uff0c2km\uff0c\u4e14MN\u4e3a3km\uff0e\u73b0\u8ba1\u5212\u5728\u6cb3\u5cb8\u4e0a\u5efa\u4e00\u62bd\u6c34\u7ad9P\uff0c\u7528\u8f93\u6c34\u7ba1\u5411\u4e24\u4e2a\u6751\u5e84A\uff0cB\u4f9b\u6c34\uff0c\u6c42\u6c34\u7ba1\u957f\u5ea6\u6700\u5c11\u4e3a\u591a\u5c11\uff0e\uff08\u7cbe\u786e\u52300.1km)
23\uff0e\u6c42\u4e0b\u5217\u5404\u5f0f\u4e2dx\u7684\u503c\uff0e
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\u5f00\u7acb\u65b9\u5f97\uff1ax\ufe632=\ufe634\uff0c
\u89e3\u5f97\uff1ax=\ufe632\uff0e
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\u5373x=4\uff0cy=\ufe632\uff0c\u6240\u4ee5==\uff0e
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\u3010\u8003\u70b9\u3011\u52fe\u80a1\u5b9a\u7406\u7684\u5e94\u7528\uff0e
\u3010\u5206\u6790\u3011\uff081\uff09\u5728\u76f4\u89d2\u4e09\u89d2\u5f62ECF\u4e2d\uff0c\u5229\u7528\u52fe\u80a1\u5b9a\u7406AC\u5373\u53ef\uff1b
\uff082\uff09\u5728\u76f4\u89d2\u4e09\u89d2\u5f62BC\u4e2d\uff0c\u5229\u7528\u52fe\u80a1\u5b9a\u7406\u8ba1\u7b97\u51faAC\u957f\u5373\u53ef\uff1b
\uff083\uff09\u9996\u5148\u8ba1\u7b97\u51faAC=4.8m\u65f6BC\u7684\u957f\u5ea6\uff0c\u7136\u540e\u518d\u6839\u636e\u9898\u610f\u5f97\u5230\u5e94\u5c06\u68af\u5b50\u518d\u5411\u5899\u63a8\u8fdb\u7684\u8ddd\u79bb\uff0e
\u3010\u89e3\u7b54\u3011\u89e3\uff1a\uff081\uff09\u7531\u9898\u610f\u5f97\uff1aEF=5m\uff0cCF=4m\uff0c
\u5219EC===3\uff08m\uff09\uff0e
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\uff082\uff09\u7531\u9898\u610f\u5f97\uff1aBF=1m\uff0c\u5219CB=4\ufe631=3\uff08m\uff09\uff0c
AC===4\uff08m\uff09\uff0c
\u5219AE=AC\ufe63EC=1m\uff0e
\u7b54\uff1a\u68af\u5b50\u7684\u9876\u7aef\u5347\u9ad8\u4e861m\uff1b
\uff083\uff09\u82e5AC=4.8m\uff0c\u5219BC===1.4\uff08m\uff09\uff0c
\u5e94\u5c06\u68af\u5b50\u518d\u5411\u5899\u63a8\u8fdb3\ufe631.4=1.6\uff08m\uff09\uff0e
\u7b54\uff1a\u5e94\u5c06\u68af\u5b50\u518d\u5411\u5899\u63a8\u8fdb1.6m\uff0e
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27\uff0e\u5728\u4e00\u5e73\u76f4\u6cb3\u5cb8l\u7684\u540c\u4fa7\u6709A\uff0cB\u4e24\u4e2a\u6751\u5e84\uff0cA\uff0cB\u5230l\u7684\u8ddd\u79bbAM\uff0cBN\u5206\u522b\u662f3km\uff0c2km\uff0c\u4e14MN\u4e3a3km\uff0e\u73b0\u8ba1\u5212\u5728\u6cb3\u5cb8\u4e0a\u5efa\u4e00\u62bd\u6c34\u7ad9P\uff0c\u7528\u8f93\u6c34\u7ba1\u5411\u4e24\u4e2a\u6751\u5e84A\uff0cB\u4f9b\u6c34\uff0c\u6c42\u6c34\u7ba1\u957f\u5ea6\u6700\u5c11\u4e3a\u591a\u5c11\uff0e\uff08\u7cbe\u786e\u52300.1km\uff09

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\u3010\u5206\u6790\u3011\u6839\u636e\u8f74\u5bf9\u79f0\u7684\u6027\u8d28\uff1a\u627e\u51fa\u70b9A\u5173\u4e8e\u76f4\u7ebfl\u7684\u5bf9\u79f0\u70b9A\u2032\uff0c\u8fde\u63a5A\u2032B\u4ea4\u76f4\u7ebfMN\u4e8e\u70b9P\uff0c\u7ed3\u5408\u56fe\u5f62\u5229\u7528\u52fe\u80a1\u5b9a\u7406\u5373\u53ef\u5f97\u51fa\u7b54\u6848\uff0e
\u3010\u89e3\u7b54\u3011\u89e3\uff1a\u5982\u56fe\uff0c

\u5ef6\u957fAM\u5230A\u2032\uff0c\u4f7fMA\u2032=AM\uff0c\u8fde\u63a5A\u2032B\u4ea4l\u4e8eP\uff0c\u8fc7A\u2032\u4f5cA\u2032C\u5782\u76f4\u4e8eBN\u7684\u5ef6\u957f\u7ebf\u4e8e\u70b9C\uff0c
\u2235AM\u22a5l\uff0c
\u2234PB=PA\u2032\uff0c
\u2235A\u2032M\u22a5l\uff0cCN\u22a5l\uff0cA\u2032C\u22a5BC\uff0c
\u2234\u56db\u8fb9\u5f62MA\u2032CN\u662f\u77e9\u5f62\uff0c
\u2234CN=A\u2032M=3km\uff0cA\u2032C=MN=3km\uff0c
\u2234BC=3+2=5km\uff0c
\u2234AP+BP=A\u2032P+PB=A\u2032B=\u22485.8km\uff0e
\u7b54\uff1a\u6c34\u7ba1\u957f\u5ea6\u6700\u5c11\u4e3a5.8km\uff0e
\u3010\u70b9\u8bc4\u3011\u6b64\u9898\u8003\u67e5\u8f74\u5bf9\u79f0\ufe63\u6700\u77ed\u8def\u7ebf\u95ee\u9898\uff0c\u638c\u63e1\u8f74\u5bf9\u79f0\u7684\u6027\u8d28\uff0c\u52fe\u80a1\u5b9a\u7406\uff0c\u77e9\u5f62\u7684\u5224\u5b9a\u4e0e\u6027\u8d28\u662f\u89e3\u51b3\u95ee\u9898\u7684\u5173\u952e\uff0e

设矩形的长为x,宽为y

x*y=48
x²+y²=10²
所以 (x+y)²=x²+y²+2x*y=196
得 x+y=16
周长=2(x+y)=32(米)

分析:48分解质因数=2*2*2*2*3
由6^2+8^2=10^2可知,矩形的边长分别是6和8,因此矩形的周长是2*6+2*8=28m。

3 4 5 "6 8 10"

6*2+8*2=28

首先,跟据题意画出矩形(长方形),然后连接两对角线,跟据勾股定律列出方程。我的手机没有作图的功能,所以无法给出过程,我也是一个初二的学生。

a×b=48
a²+b²=10²
a=8
b=6

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