1/4*9+1/9*14+1/14*19+1/19*24……+1/79*84
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1/4*9+1/9*14+1/14*19+1/19*24……+1/79*84
请尽快解答,(最好把1/5*8+1/8*11+1/11*14+……+1/98*101也算出来)要过程,
请尽快解答,(最好把1/5*8+1/8*11+1/11*14+……+1/98*101也算出来)要过程,
1/4*9+1/9*14+1/14*19+1/19*24……+1/79*84
=[(1/4-1/9)+(1/9-1/14)+……+(1/79-1/84)]/5
=(1/4-1/84)/5
=(20/84)/5
=1/21
1/5*8+1/8*11+1/11*14+……+1/98*101
=[(1/5-1/8)+(1/8-1/11)+……+(1/98-1/101)]/3
=(1/5-1/101)/3
=(96/505)/3
=32/505
=[(1/4-1/9)+(1/9-1/14)+……+(1/79-1/84)]/5
=(1/4-1/84)/5
=(20/84)/5
=1/21
1/5*8+1/8*11+1/11*14+……+1/98*101
=[(1/5-1/8)+(1/8-1/11)+……+(1/98-1/101)]/3
=(1/5-1/101)/3
=(96/505)/3
=32/505
19、15、18、18、25……、9,3,1,14,20,13,15,22,5,
17,9] [19,8,9] [23,15] [8,1,15] [24,9,1,14,7] [14,9] ,[25,9,
1 2 6 7 15 16…… 3 5 8 14 17…… 4 9 13 18…… 10 12 19…… 11 20……
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+……1
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21……+99+1
23 15 8 5 14 19 8 1 14 24 9 14 7 26 1 9 10 9 1分别转换成2进式
计算1+2+3+4-5-6-7-8+9+10+11+12-13-14-15-16……+1993+1994+1995+19
1+2-3+4-5+6-7+8-9+10-11+12-13+14-15+16-17+18-19+20……-99+100
(1,2);(3,4,5,6);(7,8,9,10,11,12);(13,14,15,16,17,18,19,20)……
1-1/2+1/3-1/4+1/5-1/6+1/7-1/8+1/9……+1/19-1/20=?
20+19-18+17+16+15-14-13+……+4+3-2-1
1,1,2,3,4,6,9,13,19……求这列数的排列规律.