Question

設x=a²b²+5,y=2ab-a²-4a,若x＞y,則實數a,b滿足的條件是________.

Answer 1

思路解析：x-y=(ab-1)²+(a+2)²,

因為x＞y,所以（ab-1）²+(a+2)²＞0,則ab-1≠0或a+2≠0.

即ab≠1或a≠-2.

答案：ab≠1或a≠-2