Question

已知集合A={x|0≤x-m≤3},B={x|x

Answer 1

(1)

A={x| 0≤x-m≤3 },B={x| x

m≥0 and 3+m ≤ 3

m≥0 and m ≤0

=> m=0 #

(2)

A∪B=B => A is subset of B

3+m< 0 or m>3

m< -3 or m > 3 #