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nguyenbinh.nvb12345
2 năm trước
cho phương trình bậc hai ẩn x , m là tham số : x^2 +mx+2m-4 =0 (1) a) chứng minh phương trình (1) luôn có nghiệm với mọi giá trị của m b) gọi x1;x2 là hai nghiệm phân biệt của phương trình (1) . Tìm tất cả các giá trị nguyên dương của m để biểu thức A =$\frac{x1.x2}{x1+x2}$  có giá trị nguyên
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