giả pt \(\left(x^2+2x\right)^2-6x^2+12x+9=0\)

cho các số thực x, y, z >2

tìm gtnn \(P=\frac{x}{\sqrt{y+z-4}}+\frac{y}{\sqrt{z+x-4}}+\frac{z}{\sqrt{x+y-4}}\)

1.cho a, b, c thỏa mãn \(a^3+b^3+c^3=3abc\)

tính gtbt: \(P=\left(1+\frac{a}{b}\right)\left(1+\frac{b}{c}\right)\left(1+\frac{c}{a}\right)\)

2. tìm nghiệm nguyên dương của phương trình \(\frac{1}{xy}+\frac{1}{yz}+\frac{1}{zx}+\frac{9}{xyz}=1\)

cho 2 số dương x, y thay đổi sao cho x+y =1

tìm gtnn của \(A=\left(1-\frac{1}{x^2}\right)\left(1-\frac{1}{y^2}\right)\)

Supply the approprite form of the words in the brackets. Write them on your answer sheet

1. The main goals of the association of southeast sian nations are to promote peace and __________ in the region. ( stable)

2. The company is not taking on any new __________ this year. ( employ)

3. The crowd showd its ________ by shouting insults at the president. (approve)

4. Some work is going on to_______ the brige, which carries a great deal of traffic ( strong)

5. If we don't __________ on electricity, there will be power cuts. ( ecomomy)

6. The special effects used in that movie were very ______________ (real)

7. Different conservation efforts have been made in order to save _________ species. ( danger )

8. i don't know who it was - with a mask on she was completely ________ ( recognise)

9. his boss told him off beause he had behaved _______ ( response )

10. newsapers and magazines present information ________ ( vision )

cho 3 số thực không âm x, y, z thỏa mãn \(x^2+y^2+z^2\le3y\)

\(P=\frac{1}{\left(x+1\right)^2}+\frac{4}{\left(y+2\right)^2}+\frac{8}{\left(z+3\right)^2}\)

cho \(\frac{1}{x^2}+\frac{1}{y^2}+\frac{1}{z^2}=1\)

tính gtln của \(P=\frac{1}{y+2x}+\frac{1}{z+2y}+\frac{1}{x+2z}\)