若a/b=c/d=e/f=2/5,求 (1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3) 比较(1)(2)结论,发现规律若a/b=c/d=e/f=2/5,求 :(1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3)比较(1)(2)结论,发现规律.
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![若a/b=c/d=e/f=2/5,求 (1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3) 比较(1)(2)结论,发现规律若a/b=c/d=e/f=2/5,求 :(1) (a-c)/(b-d); (2) (2a+3c-4e)/(2b+3d-4f); (3)比较(1)(2)结论,发现规律.](/uploads/image/z/2770193-65-3.jpg?t=%E8%8B%A5a%2Fb%3Dc%2Fd%3De%2Ff%3D2%2F5%2C%E6%B1%82+%281%29+%28a-c%29%2F%28b-d%29%3B+%282%29+%282a%2B3c-4e%29%2F%282b%2B3d-4f%29%3B+%283%29+%E6%AF%94%E8%BE%83%281%29%282%29%E7%BB%93%E8%AE%BA%2C%E5%8F%91%E7%8E%B0%E8%A7%84%E5%BE%8B%E8%8B%A5a%2Fb%3Dc%2Fd%3De%2Ff%3D2%2F5%2C%E6%B1%82+%EF%BC%9A%281%29+%28a-c%29%2F%28b-d%29%3B+%282%29+%282a%2B3c-4e%29%2F%282b%2B3d-4f%29%3B+%283%29%E6%AF%94%E8%BE%83%EF%BC%881%EF%BC%89%EF%BC%882%EF%BC%89%E7%BB%93%E8%AE%BA%2C%E5%8F%91%E7%8E%B0%E8%A7%84%E5%BE%8B.)
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