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PUMaC 2008 · 几何（B 组） · 第 1 题

PUMaC 2008 — Geometry (Division B) — Problem 1

专题
Discrete Math / 离散数学
难度
L3
来源
PUMaC

题目详情

  1. (2 points) If a rectangle’s length is increased by 30% and its width is decreased by 30%, by what percentage does its area change? State whether the area increases or decreases.
解析
  1. If a rectangle’s length is increased by 30% and its width is decreased by 30%, by what percentage does its area change? State whether the area increases or decreases. ( ANS: Decreases 9% CB: TW, ACH, RH)