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由a2+b2=25,a2-b2=7建立方程組,求得a=4,b=3,∵32+42=52,根據畢氏定理的逆定理,三角形為直角三角形,c為斜邊,c上的高為h,由面積公式S=12ab=12ch,∴h=125,故填125.
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