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
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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+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+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+19/6+61/12+141/20+271/30+463/42+729/56+1081/72+1531/90
=1+(3+1/6)+(5+1/12)+(7+1/20)+(9+1/30)+(11+1/42)+(13+1/56)+(15+1/72)+(17+1/90)
=(1+3+5+7+9+11+13+15+17) +1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10)
=(1+17)*9/2 +(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)
=81+1/2-1/10
=81又2/5
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=