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2 năm trước
Cho phương trình: x² + 2(2m - 1)x + 3(m² - 1) = 0 với m là tham số. a) Với giá trị nào của m thì phương trình có nghiệm. b) Trong trường hợp phương trình có hai nghiệm x1, x2, dùng hệ thức Vi - ét, hãy tìm hệ thức liên hệ giữa hai nghiệm x1 và x2 của phương trình mà không phụ thuộc vào m. Mọi người giải giúp em. EM CẢM ƠN.
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