số cần tìm : 482

a,7*62-14+40*7 

3 lần

3 lần

hay là đề ntn ạ?

\(\dfrac{x-2}{x+3}=\dfrac{5}{7}\\ =>\left(x-2\right)\cdot7=\left(x+3\right)\cdot5\)

\(7x-14=5x+15\)

\(7x-5x=15+14\)

\(2x=29\\ x=14,5\)

\(\dfrac{x-2}{x}+3=\dfrac{5}{7}\)

\(\dfrac{x-2}{x}=\dfrac{5}{7}-3\)

\(\dfrac{x-2}{x}=\dfrac{-16}{7}\)

\(=>x\cdot\left(-16\right)=\left(x-2\right)\cdot7\)

\(-16x=7x-14\)

\(-16x-7x=-14\)

\(-23x=-14\\ x=\dfrac{14}{23}\)

 Did you go to the zoo last week, Phong?

 What did the peacocks do when you were there?

 She saw two pandas at the zoo

 What are your favourite animals at the zoo?

 The python moved really slowly and quietly

 The pandas were really cute and did things slowly

 The gorillas was moved quickly when Nam at the zoo

 Hung and i saw a lot of animals at the circus

 The tigers were fast because they liked Mai

 The monkeys jumped down and up very quickly

1. Did you go to the zoo last week, Phong?

2. What did the peacocks do when you were there?

3. She saw two pandas at the zoo.

4. What are your favourite animals at the zoo?

5. The python moved really slowly and quietly.

6. The pandas were really cute and did things slowly.

7.

The gorillas was quick moved when Nam at the zoo.

2. I and Hung saw a lot of animals in the circus.

3. Mai liked tiger because they were fast.

4.The mokeys jumped up and very quiickly

HT

\(=8x^3-4x^2y-4x^2+2xy-2xy^2+y^3\)

Vì từ  có  số

a. went

b.How did you go to the zoo?

jumped

saw

didn't see

 …went…

 …go…

 …jumped…

 …saw…

 …didn't see…

 -  dfhj mình cũng đang vắt hết cả óc ra để nghĩ đây

a) 5x - 16 = 40 + x 

   5x  -x = 40 +16

   4x      = 56

     x       = 56 : 4 

     x       =  14

b, 4x - 10 = 15 - x 

   4x + x = 15 +10

   4x + x  = 25

   5x  = 25 

   x = 25 : 5

  x = 5

\(\dfrac{35.9-7.3}{17.5+17.11}=\dfrac{7.5.3^2-7.3}{17.\left(5+11\right)}=\dfrac{7.3\left(5.3-1\right)}{17.16}=\dfrac{21.14}{17.16}=\dfrac{3.7.7.2}{17.2^4}=\dfrac{3.7^2}{17.2^3}\)