去分母得：2（2x-1）-3（x+2）=6，
去括号得：4x-2-3x-6=6，
移项得：4x-3x=6+6+2，
合并同类项得：x=14．
患者，60岁。男性。突发头痛、呕吐、视物旋转伴行走不稳2小时。查体：一侧肢体共济失调，眼球震颤，构音障碍。
确诊的首选检查是（）。
A.腰椎穿刺
B.头颅CT
C.TCD
D.X线片
E.B超
An analyst does research about derivative markets. Which of the following statements is most likely among criticisms of derivative markets（）
A. Derivativesprovide price information.
B. Derivativesreduce transaction costs.
C. Derivatives areoverly complex.
