题目

Over the years, overseasChinese have enthusiastically supported and p in China's economic construction in variousways. 答案：【1】participated4．记关于x的不等式$\frac{x-a}{x+4a}$＜0的解集为P，不等式|x-1|≤3 的解集为Q．（1）若a=3，求P； （2）若Q⊆P，求a的取值范围．