Bonsoir,
16/28 =
16 = 2 x 2 x 2 x 2
28 = 2 x 2 x 7
16/28 = [(2 x 2) x (2 x 2)] / [(2 x 2) x 7] = (4 x 4) / (4 x 7) = 4/7
250/100 =
250 = 2 x 5 x 5 x 5
100 = 2 x 2 x 5 x 5
250/100 = [(2 x 5 x 5) x 5] / [(2 x 5 x 5) x 2] = (50 x 5) / (50 x 2) = 5/2.
180/90 =
180 = 2 x 2 x 3 x 3 x 5
90 = 2 x 3 x 3 x 5
180/90 = [(2 x 3 x 5) x (2 x 3)] / [(2 x 3 x 5) x 3] = (30 x 6) / (30 x 3) = 6/3.
245/65 =
245 = 5 x 7 x 7
65 = 5 x 13
245/65 = [5 x (7 x 7)] / (5 x 13) = (5 x 49) / (5 x 13) = 49/13.
