已知f(x)=x²-(a+1/a)x+1 (1)当a=1/2时,解不等式f(x)﹤=0 (2)若a﹥0,解关于x的不等式f(x)﹤=0已知f(x)=x²-(a+1/a)x+1(1)当a=1/2时,解不等式f(x)﹤=0(2)若a﹥0,解关于x的不等式f(x)﹤=0
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/26 03:43:26
![已知f(x)=x²-(a+1/a)x+1 (1)当a=1/2时,解不等式f(x)﹤=0 (2)若a﹥0,解关于x的不等式f(x)﹤=0已知f(x)=x²-(a+1/a)x+1(1)当a=1/2时,解不等式f(x)﹤=0(2)若a﹥0,解关于x的不等式f(x)﹤=0](/uploads/image/z/7162776-0-6.jpg?t=%E5%B7%B2%E7%9F%A5f%28x%29%3Dx%26%23178%3B-%28a%2B1%EF%BC%8Fa%29x%2B1+%281%29%E5%BD%93a%3D1%EF%BC%8F2%E6%97%B6%2C%E8%A7%A3%E4%B8%8D%E7%AD%89%E5%BC%8Ff%28x%29%EF%B9%A4%3D0+%282%29%E8%8B%A5a%EF%B9%A50%2C%E8%A7%A3%E5%85%B3%E4%BA%8Ex%E7%9A%84%E4%B8%8D%E7%AD%89%E5%BC%8Ff%28x%29%EF%B9%A4%3D0%E5%B7%B2%E7%9F%A5f%28x%29%3Dx%26%23178%3B-%28a%2B1%EF%BC%8Fa%29x%2B1%281%29%E5%BD%93a%3D1%EF%BC%8F2%E6%97%B6%2C%E8%A7%A3%E4%B8%8D%E7%AD%89%E5%BC%8Ff%28x%29%EF%B9%A4%3D0%282%29%E8%8B%A5a%EF%B9%A50%2C%E8%A7%A3%E5%85%B3%E4%BA%8Ex%E7%9A%84%E4%B8%8D%E7%AD%89%E5%BC%8Ff%28x%29%EF%B9%A4%3D0)
已知f(x)=x²-(a+1/a)x+1 (1)当a=1/2时,解不等式f(x)﹤=0 (2)若a﹥0,解关于x的不等式f(x)﹤=0已知f(x)=x²-(a+1/a)x+1(1)当a=1/2时,解不等式f(x)﹤=0(2)若a﹥0,解关于x的不等式f(x)﹤=0
已知f(x)=x²-(a+1/a)x+1 (1)当a=1/2时,解不等式f(x)﹤=0 (2)若a﹥0,解关于x的不等式f(x)﹤=0
已知f(x)=x²-(a+1/a)x+1
(1)当a=1/2时,解不等式f(x)﹤=0
(2)若a﹥0,解关于x的不等式f(x)﹤=0
已知f(x)=x²-(a+1/a)x+1 (1)当a=1/2时,解不等式f(x)﹤=0 (2)若a﹥0,解关于x的不等式f(x)﹤=0已知f(x)=x²-(a+1/a)x+1(1)当a=1/2时,解不等式f(x)﹤=0(2)若a﹥0,解关于x的不等式f(x)﹤=0
(1)、将a=1/2代入 f(x)=x²-(a+1/a)x+1
x²-(1/2 +2)x+1≤0
化简方程(x-5/4)^2≤9/16
所以1/2≤x≤2
(2)若a﹥0,解关于x的不等式f(x)﹤=0
f(x)≤0
x^2-(a+1/a)+1≤0
(x-a)(x-1/a)≤0
若0