Ta có: 

xyz = 100x +10y +z = 111x -11x +10y +z = 37.3x -(11x-10y-z) chia hết cho 37 
=> (11x-10y-z) chia hết cho 37 

Lại có: 
xyz -yzx = 100x +10y +z -100y -10z -x = 99x -90y -9z = 9.(11x-10y-z) chia hết cho 37 

Vậy yzx cũng phải chia hết cho 37

nha

Tìm x biết

a,(x+1)⁴ =(x+1)²

            x= 0

\(5^{36}=\left(5^3\right)^{12}=125^{12}\)

\(11^{24}=\left(11^2\right)^{12}=121^{12}\)

\(vì\)\(125^{12}>121^{12}\)

\(\Rightarrow5^{36}>11^{24}\)

Ta có :

5³⁶ = ( 5³ )¹² = 125¹²

11²⁴ = ( 11² )¹²  = 121¹²

=> 125¹² > 121¹²

=> 5³⁶ > 11²⁴

I and Hung are team mates in our school’s soccer team, and that is the reason we became best friends. At first we did not know each other, but we quickly became close after just a few weeks. Hung is a good player, so he always helps me prace to improve my skills. In order to thank him, I become his instructor in some of the subjects in class. I am as tall and slim as Hung, and many people say that we look brothers. In fact, we are even closer than brothers. We can share almost everything, from feelings to clothes and hobbies. I always proud of our friend ship, and we will keep it this as long as we can.
 

I have a close friend, play with you from baby. In addition to the classmates, maybe she is the one she loves the most. You are Ngoc Duy in the next class.

I know you Duy once happened to meet on the school grounds. We quickly get to know each other, play together and then we do not know each other. This year, Duy turned eleven years old. You have the right shape, not high nor low, only higher than half of the head. The skin is slightly stiff. Your hair is black, always neat. Full face and smiling. His bright eyes make you look very smart. What you do is also swift, only the flash is finished.

Duy is very gentle, or give up you. When she's free, she often asks her to study or play chess. Whenever you play something, it usually gives you a chance to play first. Whether you win or lose, your face always smiles. She is very good at school, she is often praised by the teacher. Every year she receives the school and class rewards.

Playing together for nearly five years, we have a lot of memories. Once, we play chase, Duy was stumbled stone, falling all the limbs. Both parents are afraid of your face. Fortunately, nothing happened. The next day they grinned again.

The school year is fast. Next year the new school is sure to no longer learn together. Anyway, we will still keep beautiful memories of each other.

a, không thể 

b, 5

c, 5

d, 3

Mình biết nè mình thương và khâm phục ông ấy lắm vì ông rất giỏi

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