已知实数a,b满足1≤a b≤3且-1≤a-b≤1,则4a 2b的取值范围为______. 已知实数a,b满足1≤a b≤3且-1≤a-b≤1,则4a 2b的取值范围为______. 发布时间:2025-07-21 14:52:26