p:å½æ°f(x)=lg(x²-4x+a²)çå®ä¹å为r,
<==>å
³äºxçä¸çå¼x^2-4x+a^2>0ç解éæ¯R,
<==>a^2>4x-x2ææç«ï¼4x-x^2=-(x-2)^2+4<=4,
<==>a^2>4,
<==>a>2æa<-2.
q:对äºä»»æmâ[-3,3]ï¼ä¸çå¼a²-2a+2â¥â(m²+16)ææç«,
<==>a^2-2a+2>=5,
<==>a^2-2a-3>=0,
<==>a>=3ï¼æa<=-1.
å½é¢(éP)â§(éq)ä¸pâ§qå为åå½é¢,
<==>pçqåï¼æpåqçï¼
<==>{a>2æa<-2,-1<a<3},æ{-2<=a<=2,a>=3æa<=-1},
<==>2<a<3,æ-2<=a<=-1,为ææ±ã
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