\(A=\frac{2010x+2680}{x^2+1}\Leftrightarrow A\left(x^2+1\right)=2010x+2680\Leftrightarrow Ax^2-2010x+\left(A-2680\right)=0\)
Với x = 0 => A = 2680Với \(x\ne0\), xét \(\Delta'=1005^2-A\left(A-2680\right)=-A^2+2680A+1005^2\)Để A có nghiệm, ta phải có \(\Delta'\ge0\Leftrightarrow-A^2+2680A+1005^2\ge0\Leftrightarrow-335\le A\le3015\)
Vậy Min A = -335 \(\Leftrightarrow x=-3\)
Tim gia tri lon nhat va gia tri nho nhat cua bieu thuc sau: A=\(\frac{x+1}{x^2+x+1}\)
tim gia tri nho nhat cua \(\frac{4x+1}{x^2+3}\)
Tim gia tri nho nhat va lon nhat cua bieu thuc sau: \(p=\frac{4x+3}{x^2+1}\)
tim gia tri nho nhat cua P=\(\frac{x+3\sqrt{x}+2}{x}\)
tim gia tri nho nhat cua
\(\frac{1}{x^2}+x3\)
tim gia tri nho nhat cua \(\frac{3}{2+\sqrt{-x^2+2x+7}}\)
Tim gia tri nho nhat cua Q(x)= x(x-1)(x-2)(x-3)
cho m = \(\frac{-3}{\sqrt{x}+3}\) tim gia tri nho nhat cua m
a\Rut gon bieu thuc
b/Tim gia tri nho nhat cua 4A
A=\(\frac{5\sqrt{x}+4}{x+\sqrt{x}-2}+\frac{\sqrt{x}-1}{\sqrt{x}+2}-\)\(\frac{\sqrt{x}+2}{\sqrt{x}-1}\)
