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quynhhuong0915
2 năm trước
Dùng công thức nghiệm của phương trình bậc 2 giải các phương trình sau: a , x mũ 2 + 4 x - 1 = 0 b ,4 x 12 + 4 x + 1 = 0 x c, 30 x mũ 2 + 4 x + 220 = 0
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