One of my hobbies is listening to music. I like every kind of music. And I don’t know when, music has been a part of my life.
When I was a child, I had been listened to music through my mom’s songs lulled me to sleep. These songs contented my mom’s love, brought up my childhood. Music was a comfort of my sisters and my grand for me every time I missed my mom when she left me home and went to work. Maybe at that time, music is a part of me.

That is music helps me overcome lots of trouble in life. It likes a best friend sharing all my happiness and sadness. Life is not always smooth, there are many problems waiting me on the road of life, and sometimes I get hurt. Music likes a magic of the Fairy Mother in fairytales healing that hurt. Just listening to music, my soul get peace without rhyme or reason, and then, I feel my life is much more beautiful, I leave my sorrow and have more strength to continue my journey to future. Music is the way that I share my happiness to everybody. When I’m happy, I usually sing follow a song that I’m listening to. With a smile in my face and a voice from the bottom of a heart full of the love of life, they will know that I’m happy and maybe they feel happy too.

As you know, in the world have many kind of music such as pop, rock, jazz, opera....etc. The music impacted to emotion of people so much. It can change emotion of us, when you're bored with someone or you have a problem that make you tired, music can help you to relax. One more thing, music can connect everyone in the world although every nation have various culture!

I’m not a singer or a composer to know everything about music but I think that with my heart and soul, I can understand it because music has been a part of my life for a long time.

Số các số hạng là :

185 - 100 + 1 =86 (số)

Tổng trên là :

(185 + 100) . 86 : 2 = 12255

Số liền trước của 3.n + 1 là 3.n

Áp dụng BĐT bu - nh -... 

P^2 = \(\left(3.a+4\sqrt{1-a^2}\right)^2\le\left(3^2+4^2\right)\left(a^2+1-a^2\right)=25\)

=> \(P\le5\)

Vậy GTLN của P = 5 tai x = 3/5