Question 14
Define $x*y=y-x$. If $(a*b)*c=a*(b*c)$, which statement must be true?
HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01 Question 14
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01
HKIMO · HKIMO 2026 THPT (Grades 10–12 shared) National Preliminary Set 01