1 >Tim GTNN cua :
A = \(\frac{2x^2-16x+43}{x^2-8x+22}\)
cho x,y thoa man: \(8x^2+\frac{1}{4x^2}+y^2=6\). tim gtnn cua \(P=xy\)
tim GTLN hoac GTNN cua bieu thuc B= -x2-8x+5
Tim GTNN cua A=\(\frac{7}{x^2-x+2}\)
cho x>=2.Tim gtnn cua P=\(2x+\frac{3}{x}+\frac{4}{x^2}\)
Tim gtnn cua da thuc
Cau 1 M bằng x mũ 2 trừ 8x cộng 5
Cau 2 F bang 2x mũ 2 cộng 6x trừ 4
Tim gtln cua da thúc
Cau 1 7 - x - x mũ 2
Cau 2 ( 1- 2x ) nhân (x-3)
Tim GTNN cua bieu thuc
A= \({2x^2+3y^2+4xy-8x-2y+18}\)
Chox,y,z>0,x+y+Z=2.Tim GTNN cua P=\(\frac{x^2}{y+z}+\frac{y^2}{x+z}+\frac{z^2}{x+y}\)
1.Tim GTNN 2x^2-8x-3
2.tim GTNN x^4-13x^2+36
