要使函数在开区间（a,6-a^2)上有最小值,则x=1必须包含于（a,6-a^2)有：
a答案是【-2,1）x=1时，f(x)min=-2.f(x)=x^3-3x=-2时x^3-3x+2=0x³-x-2x+2=0x(x²-1)-2x+2=0x(x+1)(x-1)-2(x-1)=0(x²+x)(x-1)-2(x-1)=0(x-1)(x²+x-2)=0(x-1)(x+2)(x-1)=0(x-1)²(x+2)=0x=1,x=-2∴-2
推荐
猜你喜欢
- 10米是8米的（ ）％?算式?
- 一个长方形长减少26厘米宽减少8厘米面积减少1568平方厘米,这时正好是一个正方形.求原长方形周长
- Today,the weather is good,I do at home eggs Fried rice.Although I did,but I still careful of stirring.When I need to put
- in,her,are,the,pants,drawer.连词成句
- 若函数f(x)=a^²-2x(其中a>0,且a≠1)在R上有最大值,则满足loga（x-3）＞0的取值范围
- 难溶于水的盐易溶于水的盐
- 一杯糖水,糖5克,水30克,另一杯,糖和糖水的比是1：6,第（ ）杯甜
- send us a copy of your sponsor letter and passport.家里人是sponsor怎么还要写信寄护照?