1+19/6+61/12+141/20+271/30+463/42 计算
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1+19/6+61/12+141/20+271/30+463/42 计算
1+19/6+61/12+141/20+271/30+463/42 计算
1+19/6+61/12+141/20+271/30+463/42 计算
很简单
原式=1+3+5+7+9+11+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7
=12+12+12+1/2-1/3+1/3-1/4+1/5-1/6+1/6-1/7
=36+1/2-1/7
=36又5/14
1+19/6+61/12+141/20+271/30+463/42
=1+(3+1/6)+(5+1/12)+(7+1/20)+(9+1/30)+(11+1/42)
=(1+3+5+7+9+11) +1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)
=(1+11)*6/2 +(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=36+1/2-1/7
=36+7/14-2/14
=36又5/14
1+19/6+61/12+141/20+.+1081/72
1+19/6+61/12+141/20+271/30+463/42 计算
求1+6/19+12/61+20/141+30/271+42/463的答案是多少.
1+19/6+61/12+141/20+271/30+463/42+729/56+1081/72+1531/90=”/”是分数线请写解题思路
1/2+5/6+11/12+19/20+...+9898/9900
1/2+5/6+11/12+19/20如何解
1,6,3,10,19,32,61的规律
5/6-7/12+9/20-11/30+...+18+19/18*19-19+20/19*20
2011年杭州初一希望杯数学邀请赛第一试答案是什么?我的:2 3 4 5 6 7 8 9 10:ABAADBDCDC填空题:11 12 13 14 15 16 17 18 19 20 21 22 23 24 25:2 ; 2011; 20; 72; 24; 117; 126; 61,83; -2; 1/15 ; 1,(6);
1 3/2 11/6 25/12 ( ) A133/60 137/60 141/60 147/60
1+2+3+4+5+6+7+8+9+10+11+12+13+141+5
1/2+5/6+11/12+19/20+20/30怎么做,
1/2+1/6+1/12+19/20+.109/111= 急,儿子今天的数学题,
1/2-5/6+1/12-19/20+1/30-41/42
1/2-5/6+1/12-19/20+1/30-41/42
3/19+4/19+5/19+6/19+...+19/19+20/19+21/19=?5/6-7/12+9/20-11/30+...+(19+18)/(18*19)-(20+19)/(19*20)=?
1+1/2+5/6+11/12+19/20+……+9899/9900=?
1/2+5/6+1/12+19/20+29/30+.9701/9702+9899/9900=