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11 / 20-19 / 30 + 29 / 42-41 / 56 + 55 / 72-71 / 90 + 89 / 110-109 / 132, there should be a process
=(1-9/20)+(-1+11/30)+(1-13/42)+(-1+15/56)+(1-17/72)+(-1+19/90)+(1-21/110)+(-1+23/132)
=-9 / 20 + 11 / 30-13 / 42 + 15 / 56-17 / 72 + 19 / 90-21 / 110 + 23 / 132 plus minus 1 offset
=-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7-1/9)-(1/9-1/11)+(1/11+1/12)
=-1/4+1/12
=-1/6
For example, 19 / 90 = (10 + 9) / (10 × 9) = 1 / 9 + 1 / 10, others are similar
Characteristic (x + y) / xy = 1 / x + 1 / Y
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