Những chùm phượng đỏ rực đã nở trên những chùm cây. Thế là mùa hè đã đến! Những tiếng ve rân ran trong vòm lá như một dàn hợp xướng. Ánh nắng mặt trời nhảy nhót như những chú bé tinh nghịch. Mùa hè là khoảng thời gian nóng nực nhưng cây cối lại thi nhau khoe sắc, kết trái thơm ngon. Những chú, cô chim thi nhau bay lượn tỏ vẻ thích thú khi một mùa mới đến. Mùa hè cũng là khoảng thời gian học sinh được nghỉ sau những giờ học căng thẳng, mệt mỏi. Mùa hè đến, kỉ niệm trong tôi lại ùa về, sao mơn man quá! Những chiếc lá bàng rơi xuống sân, lũ học trò chúng tôi lại viết lên những dòng tâm sự chia sẻ: " Bay đi! Hãy mang những ước mơ của chúng tớ đi nhé. "

b) Vận tốc trung bình trên cả đoạn đường AB là:

\(\text{180 / ( 18 + 30 ) = }\) \(3,75\) (m/s)

với x,y,z thuộc số hữu tì ta có 

bn tự chép đề tại chỗ này nh a.

từ đề bài ,cộng vế theo vế ta có 

x(x+y+z)+y(x+y+z)+z(x+y+z)=-5+9+5=9

suy ra (x+y+z)(x+y+z)=9 suy ra (x+y+z)^2=3^2 hay =(-3)^2

suy ra x+y+z=3 hay=-3

xét trường hợp 1 ta có x+y+z=3

suy ra x(x+y+z)=-5 suy ra x=-5/3

suy ra y=9/3=3

suy ra z=5/3

tương tự xét trường  hợp thứ hai ta có x+y+z=-3

suy ra x=-5/-5=5/3

suy ra y=9/-3=-3

suy ra z=5/-3=-5/3

chỗ nào ko hiểu thì hỏi mình nha bn

chúc bn học tốt hi hi

1. Đò đang đứng yên so với bờ sông S

2. Vận tốc của đò bằng 0 Đ

Ls?

Volunteering is generally considered an altruistic activity and is intended to promote goodness or improve human quality of life. In return, this activity can produce a feeling of self-worth and respect. There is no financial gain involved for the individual. Volunteering is also renowned for skill development, socialization, and fun. Volunteering may have positive benefits for the volunteer as well as for the person or community served.[1] It is also intended to make contacts for possible employment. It is helping, assisting, or serving another person or persons without pay. Many volunteers are specifically trained in the areas they work, such as medicine, education, or emergency rescue. Others serve on an as-needed basis, such as in response to a natural disaster. 

No school is perfect. Almost any student can say they have no complaints about their school. It's easy to sit around with your classmates and complain about it at all, but that is not going to help things. Instead of waiting for the staff to do something, why do not you try to do something for yourself? This article will teach you different ways that you can make your school a better place for all students. The steps are:

Welcome to the new kids. As a new kid is tough-- especially if you shy or insecure. new children do not know how to navigate the school, they are not familiar with the school rules, and they are surrounded by strangers. If you have a new baby, you know how hard it is. So let the new child-friendly. Greeted them. Ask if they need help or advice. Show them around. Introducing them to the beautiful people, who can become their friends. You alone can make a good friend in the process.

Stand up for the bullied child. Most schools ask to speak to speak: "Do not bully the region," "Be a friend, not a bully!" Why, then, most people can say they have been bullied in school? Simple. Either the teacher has no idea or they do not want to stir up a fuss. Taken it upon themselves to fight bullying. When you see bullying as scheduled, say something. There are a few like-minded people with you to make you seem more competent. Report any bullying you see. If teachers do not want to do anything, take it to the principal, then general manager. If no one on the staff of the school you want to do anything, go to the media. The media is very good for bringing attention to injustice.
If your friend is a bully, I do not accept it. At first, give them a friendly warning. If bullying is severe, or they refuse to stop, to confront them about it.

Go out with someone lonely. Shy girl sit with at lunch. Chat with the autistic child. Working with teenage mothers in the class. You probably make someone day or even save a life.
Take action to improve the building. If needed repainting classrooms, ask the principal if you and some others can bring in paint and paint a classroom every weekend. Started a fundraiser to repair air conditioners. You can do something at least make posters placed in the hallway.
Help the school community. You can hold food drives and fundraising. If one of your classmates are going through chemotherapy, and give her a care package. If one of the houses of your classmates flooded and his family could not afford to fix the damage, started a fundraiser to pay for it.

Be prepared when classmates are needed. Bring extra pencils and snacks, in case a fellow student forgot their pencil or lunch money. Hand towels in case someone has an emotional breakdown.
Get others to join. There are many things you can not do it alone, so recruit some friends and acquaintances to help you in your efforts. This will also help your kindness spread even beyond the walls of the school.

No school is perfect. Hardly any student could say they have no complaints about their school. It's easy to sit around with your classmates and complain about it all, but that isn't going to help things. Instead of expecting the staff to do something, why don't you try to do something yourself? This article will teach you different ways you can make your school a better place for every student.

Steps:

Ảnh hotface mà -.- Sao qua mình được. -.-

Những từ đồng nghĩa hoàn toàn thì có thể thay thế cho nhau mà không ảnh hưởng gì đến ý nghĩa của câu (có thể thay quả bằng trái và ngược lại); còn các từ đồng nghĩa không hoàn toàn thì việc thay thế sẽ dẫn đến sự thay đổi ý nghĩa của câu, nhất là sắc thái nghĩa biểu cảm (không thể thay bỏ mạng bằng hi sinh, vì mặc dù đều có nghĩa gốc là chết nhưngbỏ mạng mang sắc thái khinh bỉ, còn hi sinh lại mang sắc thái kính trọng, ngợi ca.)