GIÚp mik bài 1 và bài 3 với ạ!!!

Tìm x, biết a) x(2x-7)-4x+14=0 b)x(x-1)+2x-2=0 c)x+x^2-x^3-x^4=0 d)2x^3+3x^2+2x+3=0

WRITE: credit - happy - money - receipt - refunds - something - wrong (C - custorment or SA - shop assistant) 1. What's ___ with it ? C/SA 2. There's ___ wrong with the volumn control. C/SA 3. Can I help my ___ back ? C/SA 4. We don't give ___, I'm Afraid. C/SA 5. I'm not ___ about that. C/SA 6. Can I give you a ___ note. C/SA 7.Have you got the ___ with you? C/SA

cần gấp, giải chi tiết đề bài: tính

3- √1-16x ² 1/1- √x ²-3 Tìm điều kiện xd của biểu thức

Thu gọn các BT sau: a) A = $\sqrt[]{9-6\sqrt[]{2}}$ + $\sqrt[]{9+6\sqrt[]{2}}$ b) B = $\frac{1+2\sqrt[]{27\sqrt[]{2}-38}-\sqrt[]{5-3\sqrt[]{2}}}{\sqrt[]{3\sqrt[]{2}-4}}$

Nguyên tử A có 80 hạt, trong số nơtron lớn hơn số proton là 5 hạt. Tìm số p,e,n

cho a,b,c >0 ,chứng minh răng ,1/a+b⩾1/4(1/a+1/b).

I.Fill in the text with the words in the box.You can use one word more than once. Much many more little less It's important for people to eat as _________ as they need to give them energy.If they eat too _______ food or the wrong food they won't have enough money.If they eat too ________,they will need to make _________ exercise;otherwise they will put on weight. Fat is very high in calories,and has been linked with disease._________ experts believe that eating _______ fat would help to reduce heart disease.Sugar isn't good for energy balance.There's no doubt that too _________ sugar makes you fat and it is not good for your teeth either. On the other hand,fibre that is found in cereals,fruits and vegetables is an important part of a healthy balanced diet.One of the simplest ways of eating ________ fibre is to eat _________ bread.It's a good,cheap source of fibre and nutrients without too _______ calories.Potatoes are good,too. So to keep healthy,eat ________ fatty food,sweets,chocolate,cakes,jam and eat _________ bread,potatoes,pasta,fresh fruit and vegetables.

E1: Read the passage then answer the questions: Life in the future will be far better than it is today. People will be able to live in a cleaner environment. breathe fresher air and eat healtheir food. Robots will be able to do most of the work in factories and they will be able to do all the dangerous things for us. More people will be able to work from home on computers so there won't be any traffic jams. Cars will be with us but they will able to run on solar energy instead of petrol. Robots will be able to interact with people. They will be able to do almost everything for us at home. 1. What will life in the future be like? ............................................................................ 2. Will people be able to live in a cleaner or dirtier environment? .......................................................................... 3. Will robots be able to do most of the work in factories for us? ................................................................................. 4. Why won't there be any traffic jams? ............................................................. 5. Will robots be able to talk to people? .................................................................. E2: Read the passage then answer the question: I'm Dr.Tina. I'm a scientist. I work in the space station. In the morning, I make new medicines. There is no gravity so it is easier to make them. In the afternoon, I walk in space. In the evening, I have a rest. I look out of the window. There is a sunrise or sunset every fifty five minutes. Then at 10 p.m, I go to bed. I sleep in a special sleeping bag, so I don't float away 1. What does Dr.Tina do in the morning? ........................................................................ 2. When does Dr.Tina go for a spacewalk? ........................................................................ 3. How often is there a sunrise or sunset? ................................................................................ 4. Why does Dr.Tina sleep in a special sleeping bag? ....................................................................... Giúp với ạ đg cần gấp