Question

Tìm x, biết:

(x+1) + (x+5) + ( x+7) = 28

Answer 1

\(\Rightarrow3x+13=28\Rightarrow3x=15\Rightarrow x=5\)

Answer 2

(x + 1) + (x + 5) + (x + 7) = 28

<=> x + 1 + x + 5 + x + 7 = 28

<=> x + x + x + 1 + 5 + 7 = 28

<=> 3x + 13 = 28

<=> 3x = 15

<=> x = 5

Answer 3

\(=x+1+x+5+x+7=28< =>3x=28-13< =>3x=15< =>x=5\)

Answer 4

\(\left(x+1\right)+\left(x+5\right)+\left(x+7\right)=28\)

\(\Leftrightarrow3x=15\)

hay x=5