论文部分内容阅读
一、1 B 2 C 3 B 4 D 5 D 6 B 7 C 8 D 9 C 10 C 11 B 12 C 13 D 14 C二、15 2∶5 16 6 17 a(a + 1) (a + 2 ) 18 2 2∶ 2 =2∶1或 1∶ 2 =2∶2或 1∶ 2 =2∶2 2等 (填一个即可 ) 19 42 0 4 2 1 (2n - 1) (2n +
I. 1 B 2 C 3 B 4 D 5 D 6 B 7 C 8 D 9 C 10 C 11 B 12 C 13 D 14 C 2.15 2 : 5 16 6 17 a (a + 1) (a + 2 ) 18 2 2: 2 = 2:1 or 1:2 = 2:2 or 1:2 =2:2 2 etc. (fill one) 19 42 0 4 2 1 (2n - 1) (2n +