2: Cho A, B, C là các tập hợp. Chứng minh rằng (a) A∩ (B\C) = (A∩ B)\(A∩ C).
(b) A∪ (B\A) = A∪ B.
(c) A\(A\B) = A∩ B.
(d) (A\B)\C = (A\C)\(B\C).

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period.value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b