1.先求對稱軸x=-0.5,所以當(dāng)x=-0.5時,有最小值3/4；當(dāng)x=1時,有最大值3.
2. 當(dāng)x=1 / (x²-x+1),而x²-x+1>0,所以當(dāng)x=1/2時,函數(shù)有最大值4/3.
3. 對稱軸x= -a,-a>0,
當(dāng)x=0,f（x）=1-a; 當(dāng)x=1, f（x）=a
1-a> a
所以1-a=2, 即a=-1.
4. 當(dāng)x=1/2,函數(shù)有最大值1/4.
5. 當(dāng)x=-2時,函數(shù) y=4x²-mx+1有最小值,即對稱軸x=m/8=-2
m= -16,f(x) =4x²+16x+1, f（1）=21.