2/56+2/72+2/90+2/110+2/132
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2/56+2/72+2/90+2/110+2/132
2/56+2/72+2/90+2/110+2/132
2/56+2/72+2/90+2/110+2/132
等于2*(1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11+1/11-1/12)
=2*(1/7-1/12)
=2*(5/84)
=5/42
通分一下 5/42