(x+5)+(x+10)+(x+15)+(x+20)=74
4x.(5+10+15+20) =74
4x+50 =74
4x =74-50
4x = 24
x = 24:4
x = 6
Ta có :
( x+5) + ( x+10) + ( x+ 15) + ( x + 20) = 74
=) 4x + 5 + 10 + 15 + 20 = 74
=) 4x + 50 = 74
=) 4x = 24
=) x = 24 : 4
=) x = 6
Vậy x = 6
\(\left(x+5\right)+\left(x+10\right)+\left(x+15\right)+\left(x+20\right)=74\)
\(\Leftrightarrow4x+\left[\left(5+15\right)+\left(10+20\right)\right]=74\)
\(\Leftrightarrow4x+50=74\)
\(\Leftrightarrow4x=24\Rightarrow x=6\)
(x + 5) + (x + 10) + (x + 15) + (x + 20) = 74
=> 4x + 5 + 10 + 15 + 20 = 74
=> 4x + 50 = 74
=> 4x = 74 - 50
=> 4x = 24
=> x = 24 : 4
=> x = 6
Vậy x = 6
Ủng hộ mk nha !!!^_^