f(x)=kx＾2+(k-1)x+2是偶函数,则f(x)递减区间__

f(x)=kx＾2+(k-1)x+2是偶函数,则f(x)递减区间__
f(x)=kx＾2+(k-1)x+2是偶函数,则f(x)递减区间__

f(x)=kx＾2+(k-1)x+2是偶函数,则f(x)递减区间__
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递减区间是(-∞,0)

f(x)=kx＾2+(k-1)x+2是偶函数
则f(-x)=kx^2-(k-1)x+2
有 k-1=-(k-1)=-k+1
2k=2
k=1
则f(x)=x^2+2
递减区间是(-∞,0)