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2、8 C 7 D 6 7 5 x m ( ) A m 5 3B m 5 3C m 5 3D m 5 38 (4 ) ( ) A 19 B 18 C 16 D 15 ( 4 16 ) 9 ) 2x _ 10 x 2x a 9 0 x 2 a _ 11 x y x y 3 2x y 6a x yx 1 3 16 (8 ) ( x 2 2x 4 x 1 2 x 2 4x 4 1 x x x 2 4x 3 0. 17 (8 ) a b a(a b) 1 5) 1 3) 1 6 1 5. (1) ( (2) 13 x 18 (8 ) 400 8 8 1 936 88 8 1 936 19 (10 ) 20
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