155× 2/19 = 155·2/19 = 310/19 = 16·19 + 6/19 = 16 6/19
16 6/19 × 3/31 = 6 + 16·19/19 × 3/31 = 310/19 × 3/31 = 310·3/19·31 = 930/589 = 30 · 31/19 · 31 = 30/19 = 1·19 + 11/19 = 1 11/19 ≈ 1.5789473684210527
