4.9 * 6.8 + 0.51 * 6.8 어떻게 간편 해

4.9 * 6.8 + 0.51 * 6.8 어떻게 간편 해

4.9 * 6.8 + 0.51 * 6.8 = (5 - 0.1) * 6.8 + (0.5 + 0.01) * 6.8
= 5 * 6.8 - 0.1 * 6.8 + 0.5 * 6.8 + 0.01 * 6.8
= 34 - 0.6 + 3.4 + 0.068
= 37.468 - 0.68
= 36.78