(1/11-1/13)+(1/13-1/15)+(1/15-1/17)+(1/17_1/19)+(1/19-1/21)+1/21=?求它等于多少
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(1/11-1/13)+(1/13-1/15)+(1/15-1/17)+(1/17_1/19)+(1/19-1/21)+1/21=?求它等于多少(1/11-1/13)+(1/13-1/15)+(1/1
(1/11-1/13)+(1/13-1/15)+(1/15-1/17)+(1/17_1/19)+(1/19-1/21)+1/21=?求它等于多少
(1/11-1/13)+(1/13-1/15)+(1/15-1/17)+(1/17_1/19)+(1/19-1/21)+1/21=?求它等于多少
(1/11-1/13)+(1/13-1/15)+(1/15-1/17)+(1/17_1/19)+(1/19-1/21)+1/21=?求它等于多少
去括号后化为
1/11 - 1/13 + 1/13 - 1/15 + 1/15 - 1/17 + 1/17 - 1/19 + 1/19 - 1/21 + 1/21
可看出,后面的都可以消掉
结果为 1/11
原式=1/11-1/13+1/13-1/15+1/15-1/17+1/17-1/19+1/19-1/21+1/21
=1/11
1\11
13 1 13 11 组成24点
|1/11-1/12|+|1/12-1/13|+|1/13-1/14+|1/14-1/15|
1/11+1/12+1/13+1/14.+1/20
[170+1 /12] ×1 /13+11 /12
1/13+2/13+3/13+4/13+5/13+6/13+7/13+8/13+9/13+10/13+11/13+12/13
13/1:
13分子1+13分子2+13分子3``````+13分子11+13分子12+13分子11``````+13分子3+13分子2+13分子1快
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?
1/7*5+1/7*9+1/9*11+1/11*13+1/13*15
(1+11/1+13/1+17/1)×(11/1+13/1+17/1+19/1)×(11/1+13/1+17/1)等于多少
有简便方法计算:|1/11-1/12|+|1/12-1/13|+|1/14-1/13|
简便计算:(1+1/11+1/13+1/17)*(1/11+1/13+1/17+1/19)-(1+1/11+1/13+1/17+1/19)*(1/11+1/13+1/17)
简便计算:(1+1/11+1/13+1/17)*(1/11+1/13+1/17+1/19)-(1+1/11+1/13+1/17+1/19)*(1/11+1/13+1/17)
(1+1/11+1/13+1/17)*(1/11+1/13+1/17+1/19)-(1+1/11+1/13+1/17+1/19)*(1/11+1/13+1/17)用分配率做用分配率
(1+1/11+1/13+1/17)乘以(1/11+1/13+1/17+1/19)-(1+1/11+1/13+1/17+1/19)乘以(1/11+1/13+1/17)
(1+1/11+1/13+1/17)×(1/11+1/13+1/17+1/19)-(1+1/11+1/13+1/17+1/19)×(1/11+1/13+1/17)等于多少?
急求高人解答 数学题!(1+1/11+1/13+1/17)x(1/11+1/13+1/17+1/19)-(1+1/11+1/13+1/17+1/19)x(1/11+1/13+1/17)=?
(1+1/11+1/13+1/17)x(1/11+1/13+1/17+1/19)-((1+1/11+1/13+1/17+1/19)x(1/11+1/13+1/17)