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Bài 6:
Mua 6,5kg đường hết:
\(20000\cdot6.5=130000\left(đồng\right)\)
Muốn tính S của mặt đáy ta lấy chiều dài của hình hộp chữ nhật nhân với chiều rộng của hình hộp chữ nhật là có diện tích 2 mặt đáy
Ko ạ , nhưng thực sự là em rất kém toán và Kt thử toàn 5 ,6 điểm thôi ạ , em lo lắm
18dm = 180cm , 7dm = 70cm
Chu vi mặt đáy là : 972 : 180 = 5, 4dm
=> Bài sai :v
Đặt chiều dài hình hộp chữ nhật là x(dm)
=>Chiều rộng hhcn là x-7(dm)
Ta có Sxq=2.18.(x+x-7)
=>36.(2x-7)=972
<=>2x-7=27
<=>2x=20
<=>x=10 =>Chiều dài hhcn là 10dm
Vậy chiều dài hhcn là 10dm
\(x\cdot\dfrac{3}{7}-x\cdot\dfrac{1}{2}=\dfrac{3}{5}\)
\(x\left(\dfrac{3}{7}-\dfrac{1}{2}\right)=\dfrac{3}{5}\)
\(x\cdot\dfrac{-1}{14}=\dfrac{3}{5}\)
\(x=\dfrac{3}{5}:\dfrac{-1}{14}\)
\(x=\dfrac{-42}{5}\)
Health and happiness are the most important things in life. We all want to know how to feel happy and enjoy this life right! Let's start with the following steps.
Balanced diet Try to follow the diet regime. Eat plenty of vegetables and fruits, eat enough nuts and grains, eat less meat and limit your intake of sugar with grease.
Exercise regularly. In order to exercise, you can run, push, sit up, sit down, and so on, lift your dumbbells, play DDR, or walk fast around the area you live in.
Health experts recommend that we sleep for eight hours a day, but for different people, the sleep time is different. It's best to spend seven hours to get enough sleep because lack of sleep can reduce your health both physically and mentally. Insomnia is the cause of lack of concentration. So, set a good sleep time, go to bed at the right time every night and get up in time every morning. It may be a bit difficult at first, but it will be easier for you to maintain this habit.
Keep a positive attitude. Instead of thinking negatively and thinking about what you do not have, be optimis and allow yourself to accept new challenges.
Make yourself busy. This is a good way to stay away from bad habits such as smoking or addictive drugs. Being busy is also important to keep you motivated at work. The more you worry, the more tired you are, instead work is a good remedy for both your mental and physical. Always make yourself busy doing household chores, playing with your pet, writing a sports arle, or doing something you love.
Harmony and have more friends. Have fun with people, stay with them and talk to them, however, do not make yourself a gossip or a slanderer. Be with the people you can trust.
Remember that nothing is worth ruining our health and happiness, so stay away from anything that damages them. Do not do anything that harms us smoking, smoking or being around or being affected by negative people.
đánh hẳn ra mới biết là bài tiếng anh nào chứ