数学简答题,求答案.急~数学简答题,求答案.急~
数学简答题,求答案.急~
A交B=2 ,A并B=(X<=3或x=4)=0,1,2,3,4a=+-2
A交B=2 ,A并B=(X<=3或x=4)=0,1,2,3,4
a=+-2