x + 5 = 15

​=> x = 15 - 5

​=> x = 10

​• Ai k mk thì mk k lại

​

Gọi số thóc ở 3 kho lần lượt là a;b;c

TA có Số thóc ở kho thứ 3 = 1/4 cả 3 kho

=> 4c = 482

=> c= 120,5

=> a+b= 482 - 120.5 =361,5

Lại có a-11,5 = b+11,5

=> a= b+23

=> b+23+b=361,5

=> 2b = 338,5

=> b = 169,25

=> a = 169.25+ 23 = 192,25

Vây số thóc của 3 kho là 192,25 ; 169,25 ; 120,5

17 x 19 + 17 x 81

= 17 x ( 19 + 81 )

= 17 x 100

= 1700

Ta có:2¹⁰⁰=(2¹⁰)¹⁰=1024¹⁰

10³⁰=(10³)¹⁰=1000¹⁰

Vì 1024¹⁰>1000¹⁰ nên 2¹⁰⁰>3¹⁰

nha  ^_^

Đặt câu hỏi với how many và trả lời:

1. Clock / living room / 1

=> How many clocks are there in the living room?

=> There is one clock in the living room.

2. Student / classroom / 48

=> How many students are there in my classroom?

=> There are 48 students in the classroom.

3. Couch / house / 3

=> How many couches are there in my house?

=> There are 3 couches in my house.

4. Person / family / 5

=> How many people are there in my family?

=> There are 5 people in my family.

5. Lamp / room / 1

=> How many lamps are there in her room?

=> There is 1 lamp in her room.

6. Bench / classroom / 24

=> How many benches are there in his classroom?

=> There are 24 benches in his classroom.

7. Bookshelf / room / 2

=> How many bookshelves are there in their room?

=> There are 2 bookshelves in their room.

8. teacher /school /50

=> How many teachers are there in my school?

=> There are 50 teachers my my school.

20 + 21 + 22 +.... + 29 + 30

= ( 30 - 1 ) : 1 + 1 

= 30 . ( 30 + 20 ) : 2 

= 1600 : 2

= 800

x + 34 = 98

x        = 98 - 34

x        = 64

=> x = 64

7x[7-1]:2=21

9 mũ 99 > 99 mũ 9

Hồng có số bông hoa là :

10 + 5 = 15 (bông hoa)

Cả 2 bạn có số bông hoa là:

10 + 15 = 25 (bông hoa)

Đáp số : 25 bông hoa.