\(\sqrt{x^2+4x+4}+\sqrt{x^2-6x+9}\)
=\(\sqrt{\left(x+2\right)^2}+\sqrt{\left(x-3\right)^2}\)
rồi phân tích ra là xong
\(\sqrt{x^2+4x+4}+\sqrt{x^2-6x+9}\)
=\(\sqrt{\left(x+2\right)^2}+\sqrt{\left(x-3\right)^2}\)
rồi phân tích ra là xong
a\Rut gon bieu thuc
b/Tim gia tri nho nhat cua 4A
A=\(\frac{5\sqrt{x}+4}{x+\sqrt{x}-2}+\frac{\sqrt{x}-1}{\sqrt{x}+2}-\)\(\frac{\sqrt{x}+2}{\sqrt{x}-1}\)
gia tri nho nhat cua bieu thuc \(\sqrt{x-1}+\sqrt{2x^2-5x+7}\)
Cho x,y la cac so thuc duong. Tim gia tri nho nhat cua bieu thuc:
\(P=\frac{xy}{x^2+y^2}+\left(\frac{1}{x}+\frac{1}{y}\right)\sqrt{2\left(x^2+y^2\right)}\)
tim gia tri lon nhat cua bieu thuc\(\frac{1}{3x-2\sqrt{6x}+5}\)
Tim gia tri nho nhat va lon nhat cua bieu thuc sau: \(p=\frac{4x+3}{x^2+1}\)
Tim gia tri lon nhat va gia tri nho nhat cua bieu thuc sau: A=\(\frac{x+1}{x^2+x+1}\)
Cho cac so thuc x , y thay doi thoa man x + y = 2 . Tim gia tri nho nhat cua bieu thuc P = ( x4 + 1 )(y4 + 1) + 2013
cho x.0 .Tim gia tri nho nhat cua bieu thuc A=9x2-5x+1/9x+2013
(x^4-5x^2+4)\(x^4-10x^2+9) tim so cac gia tri cua x de bieu thuc nguyen