Question

設U={x|-1≤x≤3},A={x|-1＜x＜3},B={x|x²-2x-3=0},求A,并且判斷A和集合B的關系.

Answer 1

解:∵U={x|-1≤x≤3},A={x|-1＜x＜3},

∴A={x|x∈U且xA}={-1,3}.

又∵B={x|x²-2x-3=0}={-1,3},∴A=B.