3 / 5 * (3 / 10 - 2 / 15) + 5 / 8 간편 계산

3 / 5 * (3 / 10 - 2 / 15) + 5 / 8 간편 계산


3 / 5 * (3 / 10 - 2 / 15) + 5 / 8
= 3 / 5 * (3 / 10 - 2 / 15) * 5 * 30 / 150 + 5 / 8
= 3 * (3 * 3 - 2 * 2) / 150 + 5 / 8
= 1 / 10 + 5 / 8
= 0.1 + 0.625
= 0. 725