mình không biết mình lớp2

ko bết

 V. Read the text and choose the best answer to fill in the blank. There are two words that are not necessary.

paper -glass- old -metal -symbol-plass- cans -furniture -clear- televisions

We can recycle most things - clothes, shoes, phones, computers, (1) __televisions__________, cars, (2) ____plass________, papers, bottles, and batteries. There are a few things that we can’t recycle - but not many!We can recycle most (3) __paper____________ and card to make new paper. We can recycle (4) ___metal_________ from many different things cans, cars and computers. It’s hard to get new metal so it’s good to recycle metal.We can recycle most types of (5) __glass__________ It’s good to sort the glass into different colours - green, brown and clear glass. Factories can only make new clear glass when 99% of the recycle glass is (6)  ___clear_________There’s a recycling (7) ____symbol________ on a lot of the things that we can recycle. There’s sometimes a symbol on the things that we can’t recycle.We have to recycle different types of (8) __furniture__________ in different ways. The recycling symbols on plas help people to sort the different types of plas.

VI. Rearrange the words to make meaningful sentences.

1. How/ Julia/ often/ piano/ the/ does/ play?  How often does Julia play the piano ?

2. What/ Helen/ his/ sister/ do/ and/ do/ it’s/ hot/ when?  What do Helen and his sister do when it's hot ?

3. Family/ our/ going/ is/ for/ stay/ Nha Trang/ to/ beach/ 5 days/ in.  Our family is going to stay in Nha Trang beach for 5 days

4. Don’t/ why/ do/ homework/ before/ you/ out/ going/ your? Why don't you do your homework before going out ?

5. They/ playing/ with/ soccer/ are/ in/ park/ now/ the/ their/ friends.   They are playing soccer in the park with their friends now

\(\frac{1}{10}\)nha

để viết được dưới dạng só thập phân hữu hạn 

khi mẫu của phân số tối giản chỉ có ước nguyên tố là 2 và 5

vậy \(P=\frac{x}{3.5.x}\) có dạng số thập phân hữu hạn thì \(\hept{\begin{cases}x⋮3\\y\in\left\{2,5\right\}\end{cases}\Rightarrow\hept{\begin{cases}x=3\\y=2\text{ hoặc }y=5\end{cases}}}\)

b. ta có :\(Q=\frac{15x}{2.7y}\Rightarrow\hept{\begin{cases}x⋮7\\y\in\left\{2,5\right\}\end{cases}\Leftrightarrow\hept{\begin{cases}x=7\\y=2\text{ hoặc y=5}\end{cases}}}\)

Ta có:

Góc BOD + góc DOC = 1200

=> góc DOC = 1200 - góc BOD = 120o - 90o = 30o

Góc AOC + góc COB = 120o

=> góc COB = 120o - góc AOC= 120o - 90o = 300

mà Góc BOC + góc COD + góc DOA = 120o 

=> góc COD  = 120o - ( góc BOC + góc DOA) = 1200 - 600 = 600 

Ta có: 

Góc BOC = Góc AOD 

=> 1/2 BOC = 1/2 AOD = 30/2 = 5⁰
hay góc nOC = góc mOD = 15o

mà góc nOm= góc nOC +góc mOD + góc COD = 15o +150 +600 = 90o

hay nO vuông góc với mO.

k cho mình nha

OD vuông góc với OD ?????

cờ vua

1  a 2d 3 b  4c  5b

Read the passage and choose the best answer.

"Let's have a picnic lunch in the countryside." This is easy to say nice to think about. You imagine a beautiful green field with a big tree in the middle which gives some shade from the sun. All around is lovely scenery and in the distance you can see the cows quietly eating the grass. After a meal of delicious sandwiches and raw fruit you can imagine lying in the warm sun then as darkness comes. You strap uy your basket and drive happily home.

But it doesn't always happen this. You must not forget that flies also raw food, that green fields are sometimes damp fields, that rain may follow the sun that peaceful cows may be unfriendly bull.

1.What is easy to say and nice to think about?

A. “Let’s have a picnic lunch in the countryside” is.

B. “Let’s have a picnic lunch in the mountain” is.

C. “Let’s have a picnic lunch in the green fields” is.

D. “Let’s have a picnic lunch in the city” is.

2.Where, in your imagine, is the big tree?

A.It’s in the middle of a beach.                                 B. It’s in the middle of a hill.

C. It’s in the middle of a beautiful stadium.                        D. It’s in the middle of a beautiful green field.

3.What can you imagine doing after meal?

A.We can imagine lying in the darkness.                B. We can imagine lying in the warm sun.

C. We can imagine lying in the badroom.               D. We can imagine lying in the hotel.

4.What also s raw fruit?

            A.Dogs also do.          B.Lions also do.                     C.Flies also do.           D.Chicken also do.

5.What may follow the sun?

A.The earth may follow the sun.                             B. The rain may follow the sun.

C. The cows may follow the sun.                             D. people may follow the sun.

Trả lời:

\(\left(-3xy^4+\frac{1}{2}x^2y^2\right)^3\)

\(=\left(-3xy^4\right)^3+3.\left(-3xy^4\right)^2.\frac{1}{2}x^2y^2+3.\left(-3xy^4\right)\left(\frac{1}{2}x^2y^2\right)^2+\left(\frac{1}{2}x^2y^2\right)^3\)

\(=-27x^3y^{12}+3.9x^2y^8.\frac{1}{2}x^2y^2+3.\left(-3xy^4\right).\frac{1}{4}x^4y^4+\frac{1}{8}x^6y^6\)

\(=-27x^3y^{12}+\frac{27}{2}x^4y^{10}-\frac{9}{4}x^5y^8+\frac{1}{8}x^6y^6\)

2,5 giờ

3,6 gio

Sao gui nhieu the?