Voi x>=-2.Tim GTNN cua bieu thuc N=x^2+2x+1/(x+2)
\(M=\left(\frac{\sqrt{x}+2}{x+2\sqrt{x}+1}-\frac{\sqrt{x}-2}{x-1}\right)N=\frac{\sqrt{x}+1}{\sqrt{x}}\) voi x>0 va x khac 1
a) tim gia tri bieu thuc cua N khi x = 25
b) rut gon S = M.N
c) tim m de S<-1
giai ho voi
tim min cua
\(A=\frac{\left(x+y+1\right)^2}{xy+x+y}+\frac{xy+x+y}{\left(x+y+1\right)^2}\) (voi x,y la so thuc duong)
cho cac so thuc duing x,y thoa man x+y<=3.Tim GTNN cua bieu thuc : P=1/5xy + 5/x+2y+5
Cho bieu thuc: \(p=\left(\frac{1}{\sqrt{x}-\sqrt{x-1}}-\frac{x-3}{\sqrt{x-1}-\sqrt{2}}\right)\left(\frac{2}{\sqrt{2}-\sqrt{x}}-\frac{\sqrt{x}+\sqrt{2}}{\sqrt{2x}-x}\right)\)
a) Tim DKXD cua bieu thuc p
b) Rut gon bieu thuc p
tim gtln cua bieu thuc A=-x+1
Tim gia tri nho nhat va lon nhat cua bieu thuc sau: \(p=\frac{4x+3}{x^2+1}\)
Cho x>=0,y,z<=2,x+y+z=3.tim min,max x^4+y^4+z^4+12(1-x)(1-y)(1-z)
Bai1 : Tim max voi x thuoc [1;3]
F(x) = (x-1)(3-x)
G(x)=(2x-1)(3-x)
Bai2: cho a,b>0 thoa man 4/a+1/b=1
Tim min p=a+b
Bai3: cm Voi moi a>0 ta co a^2(1-2a)<=1/27
Bai4: cho a,b,c >0 tm ab+bc+ca=3
Cm a^3+b^3+c^3>=3
Bai5: x,y,z>0 tm xyz=1
Cm x^2\1+y +y^2\1+z + z^2\1+x
