=3/4+15/16+35/36+63/64+99/100
=5+1x3/1+3x5/1+5x7/1+7x9/1+9x11/1
=5+2/1x(1-3/1+3/1-5/1+5/1-7/1+7/1-……+9/1-11/1)
=5+2/1x(1-11/1)
=5+2/1x11/10
=5又11/5
1*2/3*2/3+3*4/5*4/5+5*6/7*6/7+7*8/9*8/9+9*10/11*10*11
=4/9+3*16/25+5*36/49+7*64/81+9*100/121
=4/9+48/25+180/49+448/81+900/121
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