Divide 2 / 3 and 1 / 3

4 / 6 2 / 6, the smallest denominator is 6

2 out of 3, 3 out of 1 and 14 and 37 out of 3 and 42

[3,14,42]=42
2/3=28/42
1 and 3 / 14 = 17 / 14 = 51 = 42
37 of 3 and 42 = 163 / 42

X / 2 (x + 1) and 1, x ^ 2-x

The common denominator is 2 (x + 1),
However, X / 2 (x + 1) remains unchanged,
1=2（x+1)/2（x+1)
x²-x=2（x+1)（x²-x）/2（x+1).
This is convenient for calculation

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