当a取何值时,a²-2a+2的值大于1
问题描述:
当a取何值时,a²-2a+2的值大于1
答
解
a²-2a+2
=(a²-2a+1)+1
=(a-1)²+1
≥1
∴当a≠1时,a²-2a+2>1