1/30+1/42+1/56 +1/71等于多少(分数)？
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1/30=(7×71×8)/(30×7×71×8)
=3976/119280
1/42=(5×8×71)/(42×5×8×71)
=2840/119280
1/56=(5×6×71)/(56×5×6×71)
=2130/119280
1/71=(5×6×7×8)/(5×6×7×8×71)
=1680/119280
1/30+1/42+1/56+1/71
=3976/119280+2840/119280+2130/119280+1680/119280
=10626/119280
=5313/59640
=3976/119280
1/42=(5×8×71)/(42×5×8×71)
=2840/119280
1/56=(5×6×71)/(56×5×6×71)
=2130/119280
1/71=(5×6×7×8)/(5×6×7×8×71)
=1680/119280
1/30+1/42+1/56+1/71
=3976/119280+2840/119280+2130/119280+1680/119280
=10626/119280
=5313/59640
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