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Nguyễn Ngọc Khuê
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Nguyễn Hương Giang
7 tháng 2 2016 lúc 21:53

Cạnh AB và BD dài là : 12 - 3 = 9 ( cm )

Cạnh AC và CD dài là : 16 - 3 = 13 ( cm ) 

Chu vi tam giác ABC là : 9 + 13 = 22 ( cm )

Bài này chắc đúng hơn bài trước bạn ạ !

thang
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nguyen thi quynh nhu
13 tháng 3 2017 lúc 18:55

50 cm nhé

Nguyễn Thị Bảo Ngọc
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Nguyễn Ngọc Khuê
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Nguyễn Hương Giang
7 tháng 2 2016 lúc 21:50

Chu vi tam giác ABC là : 12 + 16 = 28 ( cm )

Đặng Bao
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Nguyễn Lê Phước Thịnh
5 tháng 1 2022 lúc 13:01

Chọn A

Lê Song Phương
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hà đăng khoa
8 tháng 10 2023 lúc 7:23

:}

Quỳnh Anh
8 tháng 10 2023 lúc 7:34

hog bic lm=))

Thân Ngọc An
13 tháng 10 2023 lúc 20:32

Title: A Guide to Making Your School Greener

Introduction: Welcome to our guide on how to make your school greener! By implementing sustainable practices, you can contribute to a cleaner environment and create a positive impact on the planet. In this guide, we will provide you with practical steps to help you and your school become more eco-friendly.

1. Reduce Paper Usage:
Encourage digital communication: Promote the use of emails, online platforms, and shared documents instead of relying on paper-based communication.
Opt for electronic assignments: Encourage teachers to accept electronic submissions for assignments, reducing the need for printed papers.
Utilize both sides of the paper: Encourage students and staff to print on both sides of the paper whenever possible.
2. Implement Recycling Programs:
Set up recycling stations: Place recycling bins strategically throughout the school to make it convenient for everyone to recycle paper, plastic, glass, and other recyclable materials.
Educate on proper recycling: Provide clear instructions on what can and cannot be recycled, ensuring that everyone understands the recycling process.
3. Conserve Energy:
Turn off lights and electronics: Remind students and staff to switch off lights, computers, and other electronic devices when not in use.
Utilize natural lighting: Make the most of natural light by opening curtains and blinds, reducing the need for artificial lighting during the day.
Upgrade to energy-efficient appliances: Encourage the school administration to invest in energy-efficient appliances and LED lighting, reducing energy consumption.
4. Promote Water Conservation:
Fix leaks and drips: Address any leaks or drips in faucets, toilets, or other water fixtures promptly to prevent wastage.
Encourage shorter showers: Raise awareness about the importance of shorter showers to conserve water and encourage students to be mindful of their water usage.
Collect rainwater: Install rain barrels to collect rainwater for watering school gardens or other non-potable uses.
5. Develop Green Spaces:
Start a school garden: Set up a garden where students can learn about sustainable gardening practices and grow their food.
Plant native trees and plants: Native plants require less water and maintenance, while also providing habitat for local wildlife.
Create green roofs: Implement green roofs or living walls to improve insulation and reduce energy consumption while enhancing the aesthetic appeal of the school.
Conclusion: By following these steps, you can make your school a greener and more sustainable place. Remember, small changes can have a significant impact when everyone in the school community works together towards a greener future. Start implementing these practices today and lead the way in creating a more environmentally conscious school environment.

 

giang nguyễn
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Trần huy huân
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Kiên NT
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Đinh Tuấn Việt
10 tháng 3 2016 lúc 17:45

toán lớp mấy ?

Nguyễn Thị Thanh Nhàn
2 tháng 5 2017 lúc 7:01

Chu vi tam giác ABC :

AHB + AHC = ABC

Thay số, ta được : 18+24 = 42 (cm)