Question

 tim x, biet

8,75x X + 1,35 x X = 20

 

Answer 1

Sửa đề:

8,75 × x + 1,25 × x = 20

x × (8,75 + 1,25) = 20

x × 10 = 20

x = 20 : 10

x = 2

Answer 2

`8,75 xx x + 1,35 xx x = 20`

`=> x xx (8,75 + 1,35) = 20`

`=> x xx 10,1 = 20`

`=> x = 20 : 10,1`

`=> x = 200/101`

Vậy: `x= 200/101`