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blackdragon0508
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Bài 1: Chứng minh rằng nếu |a| < 1, |b - 1| < 10, |a - c| < 10 thì |ab - c| < 20.
Bài 2: Tìm x biết: |x - 5|^1000 + |x - 6|^1000 = 1
Bài 2: Tìm x biết: |x - 5|^1000 + |x - 6|^1000 = 1