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Mathematical set problem
Let a be the equation x? -2x+2m+4 = the root of 0.

If sets A and B are not empty sets, the discriminant of the equation should be △≥0, should be: m ≤-3/2, and the equation should have at least one negative root.

1, if the equation has two negative roots, then: x1+x2 = 2; 0, there is no solution at this time;

2. If there is only one negative root, then: x 1x2 = 2m+4.

Therefore, the range of m is: m.