Ta có: 5:x=-7:y =5phan x=-7 phân ý.Mà x+y=20

Áp dụng tính chất dãy tỉ số bằng nhau ta có:

5phan x = -7 phần y = 5+(-7) trên x+y = -2 trên 20 = -1 phần 10

suy ra 5phan x x -1phan 10 = -1phan 50

7phan y x  -1phan 10 = -1 phần 70

6 k nha

Tổng là:

    1 + 5 = 6

       Đáp số:6

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1+5=6 mik nha

1+5=6 Tích dùm mình ạ cảm oen

1 + 5 = 6

k mình nhé Nguyễn Thị Thu 

1 + 9 + 5

= 10 + 5

= 15

k mik nha, k lại

Tổng là:

    1 + 9 + 5 = 15

            Đáp số:15

15 k nha

17 k nha

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Tổng là:

   12 + 5 = 17

         Đáp số:17

12+5=17 nha

Tổng là:

   1+1=2

     Đáp số:2

1+1=2

nhé bạn

2 mk tk cậu

1 + 4=5

Ai tíc mình mình tíc lại,

๖ۣۜH๖ۣۜU๖ۣۜY  ๖ۣۜR๖ۣۜI๖ۣۜO

Tổng là:

    1 + 4 = 5

        Đáp số:5

Tổng là :

1 + 4 = 5

   Đáp án : 5

`x^3-8x^2+x+42`

`=x^3-7x^2-x^2+7x-6x+42`

`=(x^3-x^2-6x)-(7x^2-7x-42)`

`=x(x^2-x-6)-7(x^2-x-6)`

`=(x^2-x-6)(x-7)`

`=(x^2-3x+2x-6)(x-7)`

`=[x(x-3)+2(x-3)](x-7)`

`=(x-3)(x+2)(x-7)`

câu trả lời là: 

 2 

 Đ/s................

**** ha

Tổng là:

    1 +1 = 2

        Đáp số:2

Tổng là:

    1 + 1 = 2

          Đáp số:2