设集合A={x^22x-1,-4},B={x-5,1-x,9},若AnB={9},求AUB.
问题描述:
设集合A={x^22x-1,-4},B={x-5,1-x,9},若AnB={9},求AUB.
答
x=-3
AUB={9,-7,-4,-8,4}