4 / 5 * 3.5 + 5.5 * 80% + 0.8 간편 연산

4 / 5 * 3.5 + 5.5 * 80% + 0.8 간편 연산

80% = 4 / 5 = 0.8
4 / 5 * 3.5 + 5.5 * 80% + 0.8
= 4 / 5 * (3.5 + 5.5 + 1)
= 4 / 5 * 10
= 8