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deltaphuongtrinhbac2
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HÆ°á»›ng dẫn tÃnh Delta (Δ) phÆ°Æ¡ng trình báºc 2 online miá»…n phà tại MaytinhHS – nháºp a, b, c → tÃnh Δ = b² − 4ac → xét dấu → nghiệm + bÆ°á»›c giải.
