3-2/1*2-7/1*2*3-14/1*2*3*4-······-98/1*2*3*····*10=?要过程
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3-2/1*2-7/1*2*3-14/1*2*3*4-······-98/1*2*3*····*10
=3-1-7/6-7/12-23/120-17/360-47/1*2*3*····*7-62/1*2*3*····*8-79/1*2*3*····*9-98/1*2*3*····*10
=1/90-47/1*2*3*····*7-62/1*2*3*····*8-79/1*2*3*····*9-98/1*2*3*····*10
=1/90-3359/302400
=3360/302400-3359/302400
=1/302400
=3-1-7/6-7/12-23/120-17/360-47/1*2*3*····*7-62/1*2*3*····*8-79/1*2*3*····*9-98/1*2*3*····*10
=1/90-47/1*2*3*····*7-62/1*2*3*····*8-79/1*2*3*····*9-98/1*2*3*····*10
=1/90-3359/302400
=3360/302400-3359/302400
=1/302400
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