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Multiplicando numerador y denominador por el mismo número
x2 x3 x4 x5
- 5 -10 -15 -20 - 25
---- = ------ = ----- = ------- = ------
7 14 21 28 35
9 18 27 36 45
---- = ----- = ------- = ------ = ------
2 4 6 8 10
- 9 - 18 - 27 - 36 -45
----- = ------ = ------ = ------- = -----
4 8 12 16 20
55 110 165 220 275
----- = -------- = -------- = ---------= -----
23 46 69 92 115