3x+2＞2(x-1)①4x-3≤3x-2②，
由①得：x＞-4，
由②得：x≤1，
∴不等式组的解集是：-4＜x≤1．
— _________________
— She is singing. [ ]
A. What are they doing?
B. What's she doing?
C. She is laughing.
何谓数字通信？数字通信偶哪些优缺点？
