Ta có: \(x+y+z=xyz\Leftrightarrow x=\frac{x+y+z}{yz}\Leftrightarrow x^2=\frac{x^2+xy+xz}{yz}\Leftrightarrow x^2+1=\frac{\left(x+y\right)\left(x+z\right)}{yz}\)\(\Rightarrow\frac{1}{\sqrt{x^2+1}}=\sqrt{\frac{yz}{\left(x+y\right)\left(x+z\right)}}\)

Tương tự, ta được: \(\frac{1}{\sqrt{y^2+1}}=\sqrt{\frac{zx}{\left(y+x\right)\left(y+z\right)}}\); \(\frac{1}{\sqrt{z^2+1}}=\sqrt{\frac{xy}{\left(z+x\right)\left(z+y\right)}}\)

Cộng theo từng vế ba đẳng thức trên, ta được: \(P=\sqrt{\frac{yz}{\left(x+y\right)\left(x+z\right)}}+\sqrt{\frac{zx}{\left(y+x\right)\left(y+z\right)}}+\sqrt{\frac{xy}{\left(z+x\right)\left(z+y\right)}}\)\(\le\frac{\frac{y}{x+y}+\frac{z}{z+x}+\frac{x}{x+y}+\frac{z}{y+z}+\frac{x}{z+x}+\frac{y}{y+z}}{2}=\frac{3}{2}\)(BĐT Cô-si)

Đẳng thức xảy ra khi x = y = z = \(\sqrt{3}\)

taị sao lại là căn 3 vậy ạ

Đ/S:113,92

Travelers to vietnam expect to experience the country's rich culture and vibrant traditions

-> Traverlers to Vietnam look_____________for experiencing the country's rich culture and vibrant traditions____________________________________________

1.\(4FeS_2+11O_2\rightarrow8SO_2+2Fe_2O_3\)

2.\(3Cu+8HNO_3\rightarrow3Cu\left(NO_3\right)_2+2NO+4H_2O\)

3. \(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+NaSO_4\)

\(1.FeS_2+O_2---->SO_2+Fe_2O_3\)

 \(4FeS_2+11O_2\rightarrow8SO_2+2Fe_2O_3\)

\(2.Cu+HNO_3---->CU\left(NO_3\right)_2+NO+H_2O\)

  \(3Cu+8HNO_3\rightarrow3Cu\left(NO_3\right)_2+2NO+4H_2O\)

\(3.CuSO_4+NaOH---->Cu\left(OH\right)_2+Na_2SO_4\)

    \(CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)

xanh :6 

vàng :1 

đỏ :2 

tím :1

mai co 23 qua bong gom nam mau .dddddddddddddddooooooooooooooooooooooooo.vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvaaaaaaaaaaaaaaaaaaaaaaaaaaaaannnnnnnnnnnnnnnnnnnnnnnnnnf;e:HNNNNNNNNnh;nh;enh;jef'hfgftylttttttttttttttttttttttttttttttttttttttttttttttttfaaaaaaaaaaaaaaaaaaaaaaaaaaaggggggggggggggggggggggggddddddgbbbdddddddddddddddddddddddddddddddddddddddddddddddddddddddddddh'9f'h'unun'9n'uni-ny9'ty8t7;rrrrrrrrrrrrrr72iq7920656565=\=-0747765543421qwtuiop]';llkjhghfdsasazxcvbm,,.///.,mnbvcxzasdfghjkl;'­¬poiuytrewq123467890-==\

vat li lop 8 ma em hoc lop 5 thi em co giai duoc khong ?

8-5=3

ko thể chả lời