题目内容
If m=2,then = ( )
(A) -2 (B)-1 (C) 1 (D) 2 。
D
解析:略
(Figure 1) In the parallelogram ABCD,AD=2AB,a point M is mid- point of segment AD,CE⊥AB,if∠CEM=40°,then the value of∠DME it( ).
(A)150° (B)140° (C)135° (D)130°