|1/11-1/12|+|1/12-1/13|+|1/13-1/14+|1/14-1/15|
|1/11-1/12|+|1/12-1/13|+|1/13-1/14+|1/14-1/15|
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?
|1\12-1\11|+|3\13-1\12|+1\14-1\13|+|1\15-1\14|+||1\16-1\15|
{1/12+(-1/11)}+{1/13+(-1/12)}+{1/14+(-1/13)}+{1/15+(-1/14)}怎
1/11*12*13+1/12*13*14+1/13*14*15等于多少?
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?我看不懂
1/11+1/12+1/13+1/14+1/15+1/16怎么算
数学计算题(设元法)(1/11+1/12+1/13+1/14+1/15)*(1/12+1/13+1/14+1/15+1/
有简便方法计算:|1/11-1/12|+|1/12-1/13|+|1/14-1/13|
计算:1/9*10+1/10*11+1/11*12+1/12*13+1/13*14+1/14*15+1/15*16+1/
1/11+1/33,1/12+1/29,1/13+1/25,1/14+1/21
1/11+1/29;1/12+1/25;1/14+1/19;1/13+1/21;