dfrac (1)(2)-|||-D.1
dfrac (1)(2) C. -1 D.1
dfrac (1)(32) ;-|||-D.1;
sqrt (2) C. dfrac (sqrt {2)}(2) D.1
(B) =2, =dfrac (1)(3).-|||-(C) =1, =dfrac (1)(2). (D) =1, =-dfrac (1)(3),求指导本题解题
dfrac (1)(2)-|||-C dfrac (1)(6)-|||-D . dfrac (1)(36)
dfrac (1)(5)(X)_(1)+dfrac (2)(5)(X)_(2)+dfrac (2)(5)(X)_(3)-|||-D .dfrac (1)(7)(
dfrac (1)(6)-|||-C. dfrac (1)(2) D. dfrac (1)(3)
dfrac (1)(6)-|||-C. dfrac (1)(2) D. dfrac (1)(3)
_(1)-(F)_(2)-|||-C. dfrac (2)(3)(F)_(1)+dfrac (1)(3)(F)_(2)-|||-D. dfrac (2)(3)(