1 * 3 * 5 + 2 * 6 * 10 + 5 * 15 * 25 / 1 * 5 * 9 + 2 * 10 * 18 + 5 * 25 * 45 간편 연산

1 * 3 * 5 + 2 * 6 * 10 + 5 * 15 * 25 / 1 * 5 * 9 + 2 * 10 * 18 + 5 * 25 * 45 간편 연산

1 * 3 * 5 + 2 * 6 * 10 + 5 * 15 * 25 / 1 * 5 * 9 + 2 * 10 * 18 + 5 * 25 * 45
= 1 * (1 * 3 * 5) + 2 * (1 * 3 * 5) + 5 * (1 * 3 * 5) / 1 * (1 * 5 * 9) + 2 * (1 * 5 * 9) + 5 * (1 * 5 * 9)
= (1 + 2 + 5) * (1 * 3 * 5) / (1 + 2 + 5) * (1 * 5 * 9)
= 1 * 3 * 5 / 1 * 5 * 9
= 1 / 3