证明三角形的中线定理拜托各位了 3Q证明ma=(1/2)√2b^2+2c^2-a^2 ; mb=(1/2)√2c^2+2a^2-b^2 mc=(1/2)√2a^2+2b^2-c^2
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![证明三角形的中线定理拜托各位了 3Q证明ma=(1/2)√2b^2+2c^2-a^2 ; mb=(1/2)√2c^2+2a^2-b^2 mc=(1/2)√2a^2+2b^2-c^2](/uploads/image/z/5494831-7-1.jpg?t=%E8%AF%81%E6%98%8E%E4%B8%89%E8%A7%92%E5%BD%A2%E7%9A%84%E4%B8%AD%E7%BA%BF%E5%AE%9A%E7%90%86%E6%8B%9C%E6%89%98%E5%90%84%E4%BD%8D%E4%BA%86+3Q%E8%AF%81%E6%98%8Ema%3D%281%2F2%29%E2%88%9A2b%5E2%2B2c%5E2-a%5E2+%EF%BC%9B+mb%3D%281%2F2%29%E2%88%9A2c%5E2%2B2a%5E2-b%5E2+mc%3D%281%2F2%29%E2%88%9A2a%5E2%2B2b%5E2-c%5E2)
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