求函数y=(1/3)的-2x²-8x+1次方(-3
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求函数y=(1/3)的-2x²-8x+1次方(-3
求函数y=(1/3)的-2x²-8x+1次方(-3
求函数y=(1/3)的-2x²-8x+1次方(-3
这个实际就是求-2x²-8x+1的取值范围
-2x²-8x+1=-2(x+2)^2+9
所以最大值为9(x=-2)
最小值为-9(x=1)
所以-2x²-8x+1的取值范围就是(-9,9)
y=(1/3)的-2x²-8x+1值域就是(1/3)^9-----3^9
(1/19683,19683)