19.方程x2−2mx+m2−1=0x^{2}-2mx+m^{2}-1=0x2−2mx+m2−1=0的一根在(0,1)(0,1)(0,1)内,另一根在(2,3)(2,3)(2,3)内,则实数mmm的取值范围是___(1,2)(1,2)(1,2)___.