计算:-1/30-1/42-1/56-1/72-1/90重在过程!请求各位数学老师的帮助!
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计算:-1/30-1/42-1/56-1/72-1/90重在过程!请求各位数学老师的帮助!
计算:-1/30-1/42-1/56-1/72-1/90
重在过程!请求各位数学老师的帮助!
计算:-1/30-1/42-1/56-1/72-1/90重在过程!请求各位数学老师的帮助!
-1/30-1/42-1/56-1/72-1/90
=-(1/30+1/42+1/56+1/72+1/90)
=-[1/(5×6)+1/(6×7)+1/(7×8)+1/(8×9)+1/(9×10)]
=-(1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10)
=-(1/5-1/10)
=-1/10