kết quả chia xong la 9256395

12345 + 12345 + 12345 + 12345

= 12345 x 4

=49380

ba rut gon phan thuc tren thu xem sao

Ta có: (x^2+4x+7)chia hết cho x+4

            x(x+4)+7 chia hết cho x+4

mà x(x+4)chia hết cho x+4

Suy ra 7 chia hết cho x+4

Suy ra x+4 thuộc ước của 7={-7;-1;1;7}

•x+4=-7

Suy ra x=-11

•x+4=-1

Suy ra x=-5

•x+4=1

Suy ra x=-3

•x+4=7

Suy ra x= 3

hình như là x ko có giá trị nào phù hợp vs đề bài 

225 chac chan

chu vi là 48

Read the passage below and answer the questions: (1 pt)

We can develop alternative sources of energy, and unless we try we’ll never succeed. Instead of burning fossil fuels we should be concentrating on more economic uses of electricity, because electricity can be produced from any sources of energy.

If we didn’t waste so much energy, our resources would last longer. We can save more energy by conservation than we can produce for the same money. Unless we do research on solar energy, wind power, tidal power, hydroelectric plants… our fossil fuels will run out and we’ll all freeze or starve to dealth.

Many countries are spending much more time and money on research because the energy from the sun, the waves and the winds last forever. We really won’t survive unless we start working on cleaner and safer sources of energy.

1. Can electricity be produced from any sources of energy ?

……………………………………………………………….

2.. What would happen if we didn’t waste so much energy?

……………………………………………………………….

3.. Why are many countries spending much more time and money doing research on energy from the sun, the waves and the wind?

……………………………………………………………….

4. What will happen unless we start working on cleaner and safer sources of energy ? ……………………………………………………………….

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