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HMMT 十一月 2014 · 冲刺赛 · 第 1 题

HMMT November 2014 — Guts Round — Problem 1

专题
Discrete Math / 离散数学
难度
L3
来源
HMMT

题目详情

  1. [ 5 ] Solve for x in the equation 20 · 14 + x = 20 + 14 · x .
解析
  1. [ 5 ] Solve for x in the equation 20 · 14 + x = 20 + 14 · x . Answer: 20 By inspection, 20 + 14 · 20 = 20 · 14 + 20. Alternatively, one can simply compute 20 · 14 − 20 x = = 20. 14 − 1