Lớp học đó có số học sinh là: 

\(25+27-18=34\)(học sinh) 

1 My sister often does yoga after school

2 How many lessons do you have on Friday

3 There are mountains and green fields around my school

4 My sister is studying in an international school

5 May's grandparents live in a country house

6 The bookshop is between the bank and the library

7 There are 45 students in my class

II. Reorder the words to make correct sentences.

1.   sister/ yoga/ often/ my/ the/ does/ school/ after.

      …my sister often does the yoga after shool……………………………………………………………………………………………

2.   lessons/ many/ have/ on/ how/ you/ do/ Friday?

      …how many  lesson do you have on Friday?……………………………………………………………………………………………

3.   green fields / there / are/ mountains/ and/ my/school/around.

      .....there are the green fields mountains around my school

4.   school/ sister/ is/ an/ my/ international/ studying/ in.

      ……my sister is studying in an international shool.…………………………………………………………………………………………

5.   Mai’s/ country/ grandparents/ live/ in/ a/ house.

      .......Mai's grandparents live in a house country........................................................................................................................................

6.   bank / between / the / library/ is/ the/ and/ bookshop/ the.

      ......the library is between the .bank and the bookshop

7.   forty-five/ class/ students/ there/ my/ are/ in.

      ………there are forty - five student in my class……………………………………………………………………………………

\(10x-2^2.5=10\)

\(10x-4.5=10\)

\(10x-20=10\)

\(10x=30\)

\(x=3\)

cảm ơn bạn

sắt: cứng, mềm khi nung chảy

NEXT WEEK / A MUSEUM / VISITING /IS / HE

=> He is visiting a museum next week.

HE IS VISITING A MUSEUM NEXT WEEK.

                        ~HT~

Nhớ k mình nha, thank you !

Gọi số tổ có thể chia được nhiều nhất là a (a \(\in\)N* ; a = ƯCLN(36 , 60) )

36 = 2² . 3²

60 = 2² . 3 . 5

=> ƯCLN(36 , 60) = 2² . 3 = 12

Vậy số tổ chia được nhiều nhất là 12, khi đó mỗi tổ có : 36 : 12 = 3 (nam) ; 60 : 12 = 5 (nữ)

813-2 . x = 15⁴  : 15²

813-2 .  x = 15²

       2 . x = 813-15²

       2 . x = 813-225

       2 . x = 588

      x = 588 : 2 

      x = 294 

                                                           100

                                                   5                 24

                                                                2          12

                                                                          2      6

                                                                               2      3

                                                Vậy 100= 2^3 .3 .5

  $    hok tốt

a. S = 1 + 2 + 2^2 + 2^3 + ... + 2^8 + 2^9

Ta có: 2 = 1 . 2

           2^2 = 2 . 2

           2^3 = 2^2 . 2

           .....

=>       1 + 2 + 2^2 + ... + 2^8 + (2^8 . 2)

=>       1 + 2 + 2^2 + ... + (2^8 . 3)

=>       1 + 2 + 2^2 + ... + 2^7 + (2^7 .6)

=>       1 + 2 + 2^2 + ... + (2^7 . 7)

=>        .....

=>        1 + 2 . 311