If the fractional equation 3xx − 1 = MX − 1 has an increasing root, then the value of M is () A. 1B. -1C. 3D. -3

If the fractional equation 3xx − 1 = MX − 1 has an increasing root, then the value of M is () A. 1B. -1C. 3D. -3

If both sides of the equation are multiplied by X-1, we can get 3x = m, ∵ the original equation has an increasing root, ∵ the simplest common denominator X-1 = 0, we can get x = 1, and substitute x = 1 into 3x = m, M = 3, so we choose C