tất nhiên lần từ nhà đến cung trăng rồi

Ta có: x.y+5x+y =4

=> x.y +5x + y +5=4+5

=> x( y+5) +(y+5)=9

=>(x+1)(y+5) = 9

=> x+1 và y+5 thuộc ước của 9.

=> x+1 =1, y+5= 9 hoặc x+1 = 9, y+5= 1 hoặc x+1=3, y+5=3

=> x=0, y=4 hoặc x=8, y= -4 hoặc x= 2, y= -2

Viết lại câu mà nghĩa không đổi với câu đầu:

1. Is your house beautiful ?

=> Is it a beautiful house ?

2.He often drives to work.

=> He often goes to work by car.

3. What about going to Dam Sen park ?

=> Why don't we go to Dam Sen park ?

Viết lại câu để nghĩa ko đổi:

1. How tall are you?

=> What is your height ?

2. It was raining very hard so we couldn't go on a picnic.

=> We couldn't go on a picnic because it was raining very hard.

3. Although it was very cold, they went swimming.

=> In spite of the fact that it was very cold, they went swimming.

4. There are thirty-five students in my class.

=> My class has thirty-five students.

5. " Would you mind not smoking in here"

=> I'd rather you didn't smoke in here.

\(\sqrt{4+\sqrt{8}}.\sqrt{2+\sqrt{2+\sqrt{2}}}.\sqrt{2-\sqrt{2+\sqrt{2}}}\\ =\sqrt{2\left(2+\sqrt{2}\right)}.\sqrt{\left(2+\sqrt{2+\sqrt{2}}\right)\left(2-\sqrt{2+\sqrt{2}}\right)}\\ =\sqrt{2}.\sqrt{2+\sqrt{2}}.\sqrt{4-\left(2+\sqrt{2}\right)}\\ =\sqrt{2}.\sqrt{2+\sqrt{2}}.\sqrt{2-\sqrt{2}}\\ =\sqrt{2}.\sqrt{\left(2+\sqrt{2}\right)\left(2-\sqrt{2}\right)}\\ =\sqrt{2}.\sqrt{4-2}\\ =2\)

Đó là siêu thị !

Tick mk nhé!!!!!!

st1 427

st 27

Combine each pair of these sentences, using if :

1. He can do a part to save the environment by buying recycled products.

=> If he buys recycled products, he can do a part to save the environment.

2. Putting garbage into the bins is one answer to minimize pollution.

=> If you put garbage into the bins, you will minimize pollution.

3. We should take the map with us or we will lose out way on the street.

=> If we don't take the map with us, we will lose out way on the street.

4. Ellen can borrow it, but she must give it back next week.

=> If Ellen gives it back next week, she can borrow it.

5. The authorities are thinking of raising the petrol peices. I will have to cycle to work.

=> If the authorities rise the petrol peices, I will have to cycle to work.

Combine each pair of these sentences, using if:

1. Recycle and we'll save natural resources.

=> If we recycle, we'll save natural resources.

2. Be careful or you will fall over the rocks.

=> If you aren't careful, you will fall over the rocks.

3. Working too much can make you feel tired.

=> If you work too much, you will feel tired.

4. Don't be careless or you will break the vase.

=> If you are careless, you will break the vase.

5. Ha can pass the exam, she has to work hard.

=> If Ha works hard, she will pass the exam.

Khối lượng của thanh sắt là:

\(D=\dfrac{m}{V}\Rightarrow m=D.V=7800.0,5=3900\left(kg\right)\)Trọng lượng của vật là:

\(P=10m=10.3900=39000\left(N\right)\)