已知a=(1/20)x+20,b=(1/20)x+19,c=(1/20)x+21,求a²+b²+c²-ab-ac-bc得值,想碎觉啊,好桑感的说
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![已知a=(1/20)x+20,b=(1/20)x+19,c=(1/20)x+21,求a²+b²+c²-ab-ac-bc得值,想碎觉啊,好桑感的说](/uploads/image/z/4111220-20-0.jpg?t=%E5%B7%B2%E7%9F%A5a%3D%EF%BC%881%2F20%EF%BC%89x%2B20%2Cb%3D%EF%BC%881%2F20%EF%BC%89x%2B19%2Cc%3D%EF%BC%881%2F20%EF%BC%89x%2B21%2C%E6%B1%82a%26%23178%3B%2Bb%26%23178%3B%2Bc%26%23178%3B-ab-ac-bc%E5%BE%97%E5%80%BC%2C%E6%83%B3%E7%A2%8E%E8%A7%89%E5%95%8A%2C%E5%A5%BD%E6%A1%91%E6%84%9F%E7%9A%84%E8%AF%B4)
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已知a=(1/20)x+20,b=(1/20)x+19,c=(1/20)x+21,求a²+b²+c²-ab-ac-bc得值,想碎觉啊,好桑感的说
已知a=(1/20)x+20,b=(1/20)x+19,c=(1/20)x+21,求a²+b²+c²-ab-ac-bc得值,想碎觉啊,好桑感的说
已知a=(1/20)x+20,b=(1/20)x+19,c=(1/20)x+21,求a²+b²+c²-ab-ac-bc得值,想碎觉啊,好桑感的说
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