1. 2X + 3×0.9 = 24.7 改寫后：2x + 2.7 = 24.7 Solution: 2x = 24.7 - 2.7 x = 22 / 2 x = 112. 12x + 34x = 123 改寫后：12x + 34x = 123 Solution: 46x = 123 x = 123 / 46 x = 2.652173913043. x - 14x = 22 - 14x = 12 改寫后：x - 14x = 22 -13x = 22 x = 22 / -13 x = -24. 22 - 14x = 12 改寫后：22 - 14x = 12 Solution: -14x = 12 - 22 -14x = -10 x = -10 / -14 x = 5 / 75. 1/3x + 5/6x = 1.4 改寫后：1/3x + 5/6x = 1.4 Solution: (2x + 5x) / 6 = 1.4 7x / 6 = 1.4 x = 1.4 * 6 / 7 x = 1.26. (x - 2) + 2 = x + 120% 改寫后：(x - 2) + 2 = x + 1.2 Solution: x - 2 + 2 = x + 1.2 x = x + 1.2 - 2 x = x - 0.87. 2(x - 2) + 2 = x + 1 改寫后：2(x - 2) + 2 = x + 1 Solution: 2x - 4 + 2 = x + 1 2x - x = 1 - 2 + 4 x = 38. (1 - 20%)(320 - x) = 320×40% 改寫后：(1 - 0.20)(320 - x) = 320×0.40 Solution: 0.80(320 - x) = 128 320 - x = 128 / 0.80 x = 320 - 160 x = 160請注意，以上解答中，我已糾正了原文中的錯誤，并提供了正確的方程解答。