If f (x) is known to be a decreasing function at [- 2, + ∞), and f (2-m) > F (3m-1), then the range of M is Such as the title

f(2-m)＞f(3m-1)
The minus function is 2-m3 / 4
The domain is 2-m > = - 2, 3m-1 > = - 2
M = - 1 / 3
To sum up, 3 / 4

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