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hoanghiep.6a3
2 năm trước
Cho pt : x^2 -4x +m-3 =0 (*) ( m là tham số ) Tìm các giá trị của m để A = x^2_1 +x^2_2+x2^_1.x^2_2( sử dụng định lý vi -ét)
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