2-|||-6 1-|||-H 7 8-|||-1-|||-CH2CH3-|||-(5) H 4-|||-CH3-|||-6 7 8 9-|||-H3C _(三
[单选题]一串数字按下面规律排列:1,3,5,2,4,6,3,5,7,4,6,8,5,7,9,…从第一个数字算起,前 100个数的和是多少?( )A.100B.1897C.1915D.2525
(1)(2)(3)(4)(5)(6)(7)(8)(9)(1)(2)(3)(4)(5)(6)(7)(8)(9)
(1)(2)①②③④⑤⑥⑦⑧⑨⑩(3)(4)(5)①②③④⑤⑥⑦⑧⑨⑩(6)(7)①②③④⑤⑥⑦⑧⑨⑩(8)(9)①②③④⑤(1)(2)①②③④⑤⑥⑦⑧⑨⑩(3
8. 9-|||-7. 4. 1-|||-温 5 5 1 4. 7. 9.-|||-9 6 2 |1 |5 5 3 9-|||-|1 4 7 8 5 2-|||
[主观题]计算。7/8-5/6=2/9+1/2=6/7-2/3=3/10+1/4=3/7+1/9=1/3-1/5=1/6+1/4=5/7-1/5=
1.设有关系R和S:-|||-R A B C-|||-6 4 2 2-|||-4-|||-6 5 3 3-|||-5-|||-5 6 8-|||-S B C D
找100以内的素数。 1 2 3 4 5 6 7 8
。(1)。(2)。(3)。(4)。(5)。(6)。(7)。(8)。(1)(2)(3)(4)(5)(6)(7)(8)
例题1 找规律,涂颜色。-|||-1 2 3 4 5 6 7 8 9 10-|||-11 12 13 14 15 16 17 18 19 20例题1找规律,涂颜