若a/b=c/d,判断代数式(a²+c²)/(ab+cd)-(ab+cd)/(b²+d²)+1值的符号?若(a+b)/c=(b+c)/a=(c+a)/b,求[﹙a+b﹚(b+c)(c+a)]/abc
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![若a/b=c/d,判断代数式(a²+c²)/(ab+cd)-(ab+cd)/(b²+d²)+1值的符号?若(a+b)/c=(b+c)/a=(c+a)/b,求[﹙a+b﹚(b+c)(c+a)]/abc](/uploads/image/z/5114595-3-5.jpg?t=%E8%8B%A5a%2Fb%3Dc%2Fd%2C%E5%88%A4%E6%96%AD%E4%BB%A3%E6%95%B0%E5%BC%8F%EF%BC%88a%26%23178%3B%2Bc%26%23178%3B%EF%BC%89%2F%EF%BC%88ab%2Bcd%EF%BC%89-%EF%BC%88ab%2Bcd%EF%BC%89%2F%EF%BC%88b%26%23178%3B%2Bd%26%23178%3B%EF%BC%89%2B1%E5%80%BC%E7%9A%84%E7%AC%A6%E5%8F%B7%3F%E8%8B%A5%EF%BC%88a%2Bb%EF%BC%89%2Fc%3D%EF%BC%88b%2Bc%EF%BC%89%2Fa%3D%EF%BC%88c%2Ba%EF%BC%89%2Fb%2C%E6%B1%82%5B%EF%B9%99a%2Bb%EF%B9%9A%EF%BC%88b%2Bc%EF%BC%89%EF%BC%88c%2Ba%EF%BC%89%5D%2Fabc)
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