∵f(x)=x^2-lx+al為偶函數(shù)
∴f(x)=f(-x)
即x²-|x+a|=(-x)²-|-x+a|
即|x+a|=|-x+a|
∴x+a=-x+a或x+a=-(-x+a)
∴2x=0或2a=0
2x=0不符合條件
∴2a=0
∴a=0
f(x)=x^2-lx+al為偶函數(shù),a=?
f(x)=x^2-lx+al為偶函數(shù),a=?
數(shù)學(xué)人氣:516 ℃時間:2020-04-14 19:01:08
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