When we ask the value of M, the equation x & # 178; - 2mx + 2m + 3 = 0 has two negative numbers
Let two negative roots be x1, x2
Because x 1 and x 2 are negative numbers, we can get x 1 + x 2 = 2m0 according to Weida's theorem
The range of M is - 3 / 2
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