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秒以后自动返回如图，△ABC的中线BE、CF相交于G，且AB=12，AC=16，BC=20，求GC的长．【考点】；．【分析】首先利用勾股定理的逆定理可判定△ABC是直角三角形，所以可求出CF的长，又因为G是△ABC重心，所以CG可求出．【解答】解：∵AB=12，AC=16，BC=20，∴AB2+AC2=BC2，∴△ABC是直角三角形，∴∠A=90°，∵F是AB中点，∴AF=6，∴CF=2+AC2==2，∵中线BE、CF相交于G，∴G是△ABC重心，∴CG：GF=2：1，∴CG=．【点评】本题考查了勾股定理以及其逆定理的运用和三角形重心的性质，题目的综合性较强，难度中等．声明：本试题解析著作权属菁优网所有，未经书面同意，不得复制发布。答题：wd1899老师　难度：0.67真题：1组卷：28
解析质量好中差
&&&&，V2.259331, You can UPLOAD any files, but there is 20Mb limit per file. 2,
VirSCAN supports Rar/Zip decompression, but it must be less than 20 files. 3, VirSCAN can scan compressed files with password 'infected' or 'virus'.
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File Name :
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File Size :3076458 byte
File Type :application/x-rar
Scanner results
Scanner results: Engine Ver
Scan result
Found nothing
7.11.213.42
Found nothing
***L SDK 3.0
Found nothing
9.0.0.4453
9.0.0.4453
Found nothing
Found nothing
4.1.3.52192
Found nothing
Found nothing
bitdefender
Found nothing
Found nothing
Found nothing
5.0.2.3300
Found nothing
23.944, 23.944
Found nothing
6.5.1.5418
Found nothing
Found nothing
V1.32.31.0
Found nothing
Found nothing
Found nothing
Found nothing
Found nothing
9.500-1005
Found nothing
Found nothing
Found nothing
Found nothing
25.55.06.04
25.55.06.04
Found nothing
Found nothing
3.9.2623.2
3.9.2623.2
Found nothing
Found nothing
Found nothing
17.47.17308
1.0.2.2108
Found nothing
Found nothing
virusbuster
15.0.985.0
■Heuristic/Suspicious ■Exact
NOTICE: Results are not 100% accurate and can be reported as a false positive by some scannerswhen and if malware is found. Please judge these results for yourself.
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