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?](/uploads/image/z/305558-62-8.jpg?t=1%2F10%2A11%2B1%2F11%2A12%2B1%2F12%2A13%2B1%2F13%2A14%2B1%2F14%2A15%E7%AD%89%E4%BA%8E%3F)
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