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mrdeath
2 năm trước
cho phương trình : x ² - 2( m - 1) x + m - 3 =0 ( m là tham số ) a, giải pt khi m=3 b,chứng minh pt luôn có 2 nghiệm phân biệt với mọi giá trị của m giúp mình bài này với
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