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Tìm lỗi sai : Cho a = b => a^2 = ab Cộng -b^2 vào 2 vế, ta có: a^2 - b^2 = ab - b^2 <=> (a + b)(a - b) = b(a - b) <=> a + b = b <=> 2b = b <=> 2 = 1 Vậy 2 bằng 1 !
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