2AM13 AB AN13 AC MN13 BC A M

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2、如图,AM=1/3 AB, AN=1/3 AC, 求证: MN=1/3 BC. A M N 证明:MN=AN-AM =1/3 AC-1/3 AB

2、如图,AM=1/3 AB, AN=1/3 AC, 求证: MN=1/3 BC. A M N 证明:MN=AN-AM =1/3 AC-1/3 AB =1/3(AC-AB)=1/3 BC B C