f(-4)=f(0),
對(duì)稱(chēng)軸為-b/2=-2,b=4
f(-2)=-2,
(-2)^2+4(-2)+c=-2
c=-6
g(x)=f(x)-x=x^2+3x-6
Δ=9+24=33>0
圖像開(kāi)口向上,與x軸沒(méi)交點(diǎn)
所以零點(diǎn)個(gè)數(shù)為0
設(shè)函數(shù)f(x)=2,x>0,f(x)=x^2+bx+c,x
設(shè)函數(shù)f(x)=2,x>0,f(x)=x^2+bx+c,x
數(shù)學(xué)人氣：965 ℃時(shí)間：2020-01-27 02:52:32
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