PUMaC 2010 · 代数（B 组） · 第 1 题
PUMaC 2010 — Algebra (Division B) — Problem 1
题目详情
- Let the operation F be defined by x F y = y − xy . Calculate (3 F 4) − (4 F 3). 2
解析
- Let the operation F be defined by x F y = y − x ∗ y . Calculate (3 F 4) − (4 F 3). Solution: -17. We have (3 F 4) − (4 F 3) = (64 − 12) − (81 − 12) = − 17. 2