因为抛物线与y轴只可能有个交点,所以此处应为x轴.要使其为抛物线,则m-1≠0,m ≠ 1∆ = 4 -4(m-1)(m/2) = -2(m² - m -2) = -2(m-2)(m+1) > 0(m-2)(m+1) < 0-1 < m < 2结合前提,解为:-1 < m < 1或1 < 2...