作业帮1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?
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1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15
=1/10-1/11+1/11-1/12+1/12-1/13+1/13-1/14+1/14-1/15
=1/10-1/15
=1/30
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15
=1/10-1/11+1/11-1/12+1/12-1/13+1/13-1/14+1/14-1/15
=1/10-1/15
=1/30