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#include<iostream>
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#include<algorithm>
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#include<math.h>
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using namespace std;
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int main()
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{
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double a,b,c,p,Area;
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cout<<"请输入三角形的三个边长："<<endl;
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cin>>a>>b>>c;
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p=(a+b+c)/2;
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Area=sqrt(p*(p-a)*(p-b)*(p-c));
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cout<<Area<<endl;
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return 0;
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}
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