1. Do you have a pet? => yes i do 

2. Do you like animals? => yes i do

3. What's your favourite animal? => my favourite animals is dog because dog very intelligent and active

4. What is a popular pet to have in your country? => i think it 's buffalo

5. Why do people have pets? => because pets can help us less stress and they are very cute too !

1. Do you have a pet?→Yes,I do

2. Do you like animals?→Yes,I do

3. What's your favourite animal?→My favourite animal is cat

4. What is a popular pet to have in your country?→I think it's cow

5. Why do people have pets?→Because pets make people feel happy when playing with them

1. No, I don't. Because my parent don't like animals :(

2. Yes, I do. I love animals

3. My favourite pets is puppy. Because it's very cute

4. I think dog is a popular pet in my country (Vietnam)

5. Because pets offer their companionship, unconditional love, loyalty and protection.

cho tui hoi laf english hay music and art v 

Làm ca sĩ đeeeeeeee

Để \(\left|x+3\right|+\left(y-4\right)^2+\left|z-9\right|=0\)

\(\Leftrightarrow\hept{\begin{cases}\left|x+3\right|=0\\\left(y-4\right)^2=0\\\left|z-9\right|=0\end{cases}\Leftrightarrow\hept{\begin{cases}x+3=0\\y-4=0\\z-9=0\end{cases}\Leftrightarrow}\hept{\begin{cases}x=-3\\y=4\\z=9\end{cases}}}\)

| x +3 | + (y-4)² + | z - 9| = 0

Do | x + 3 | \(\ge\)0 \(\forall\)x

( y - 4)² \(\ge\)0 \(\forall\)y

| z - 9|\(\ge\)0 \(\forall\)z

\(\Rightarrow\) | x+3 | + ( y-4 )² + | z-9 | \(\ge\)0 \(\forall\)x,y,z

Dấu '' = '' xảy ra khi :

\(\hept{\begin{cases}\\\\\end{cases}}\)| x+3| = 0 ( y-4 )² = 0 | z-9 | =0 

\(\hept{\begin{cases}\\\\\end{cases}}\)x + 3 = 0 ; y -4 = 0 ; z - 9 = 0

\(\hept{\begin{cases}\\\\\end{cases}}\)x = -3 ; y = 4 ; z = 9

Vậy x = -3, y = 4, z = 9

\(\left|x+3\right|+\left(y-4\right)^2+\left|z-9\right|=0\)

Mà \(\left|x+3\right|\ge0\forall x\)

      \(\left(y-4\right)^2\ge0\forall y\)

      \(\left|z-9\right|\ge0\forall z\)

\(\Rightarrow\hept{\begin{cases}x+3=0\\y-4=0\\z-9=0\end{cases}\Rightarrow}\hept{\begin{cases}x=-3\\y=4\\z=9\end{cases}}\)

Vậy x=-3, y=4, z=9

j thế bn

nhạc đó bn bấm vào mak nghe

sóng gió

Ta có : 3x = 4y = 5z \(\Leftrightarrow\)\(\frac{3}{x}\)= \(\frac{4}{y}\)= \(\frac{5}{z}\)

Theo dãy tỉ số bằng nhau ta có :

\(\frac{3}{x}\)+ \(\frac{4}{y}\)+ \(\frac{5}{z}\)\(\Leftrightarrow\)\(\frac{3+4+5}{x+y+z}\)\(\Leftrightarrow\)\(\frac{4}{3}\)

\(\Rightarrow\)x = \(\frac{3}{2}\) ; y = 3 ; z = \(\frac{15}{4}\)

Vậy x = \(\frac{3}{2}\); y =3  ; z = \(\frac{15}{4}\)

x-y = 100

y+x = 200

=> x = (200+100) : 2

     x = 150

=> y = 150 - 100

     y = 50

x - y = 100
     x= 100+ y            
            Vậy x=100+y
y+ X =200 
     x  = 200 - y
        Vậy x = 200 - y
 

ae đăng kí kênh nhận nhé !

2x=3y=4z <=> x/3=y/4=z/2=\(\frac{x+y+z}{3+4+2}=\frac{126}{9}=14\)

x/3=14 => x=14.3=42

y/4=14 => y=14.4=56

z/2=14 => z=14.2=28

Vậy ...

Ta có: \(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)và x + y + z = 126

Áp dụng t/c của dãy tỉ số = nhau ta có:

\(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}=\frac{x+y+z}{2+3+4}=\frac{126}{9}=14\)

=>\(\frac{x}{2}=14=>x=28\)

=>\(\frac{y}{3}=14=>y=42\)

=>\(\frac{z}{4}=14=>z=56\)

đi đu đưa đi của BB Trần ý

hay cực:D

ukm, mấy bài này cx hay đó