\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)=20\)
\(3x+6=20\)
\(\Leftrightarrow3x=14\)
\(\Leftrightarrow x=\frac{14}{3}\)
Vậy \(x=\frac{14}{3}\)
(x+1) + (x+2) + (x+3) = 3x + 6 = 20
=> 3x + 6 =20
3x = 20 - 6
3x = 14
x = 14/3
(x + 1) + (x+2) + (x+3) = 20
x + 1 + x + 2 + x + 3 = 20
=> (x + x + x) + (1 + 2 + 3) = 20
=> 3x + 6 = 20
=> 3x = 20 - 6
=> 3x = 14
=> x = 14 : 3 = 14/3
Vậy x = 14/3
( x + 1 ) + ( x + 2 ) + ( x + 3 ) = 20
( x + x + x ) + ( 1 + 2 + 3 ) = 20
x * 3 + 6 = 20
x * 3 = 20 - 6
x * 3 = 14
Hình như đề sai bạn ạ , mình không chắc lắm .
Cách khác,khó hơn chút.
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)=20\)
\(\Leftrightarrow3\left(x+1\right)+1+2=20\)
\(\Leftrightarrow3\left(x+1\right)=17\Leftrightarrow x+1=\frac{17}{3}\Leftrightarrow x=\frac{14}{3}\)
(x+1)+(x+2)+(x+3)=20
x+(1+2+3)=20
x+6=20
x =20-6
x =14
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)=20\\ \Leftrightarrow3\left(x+1\right)+1+2=20\)
\(\Leftrightarrow3\left(x+1\right)=17\Leftrightarrow x+1=\frac{17}{3}\Leftrightarrow x=\frac{14}{3}\)
(x + 1) + (x + 2) + (x + 3) = 20
=>x + 1 + x + 2 + x + 3 = 20
x + x + x + 1 + 2 + 3 = 20
3 * x = 20 - 6
x = 14/3
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)=20\)
\(x+1+x+2+x+3=20\)
\(x\cdot3+\left(1+2+3\right)=20\)
\(x\cdot3+6=20\)
\(x\cdot3=20-6\)
\(x\cdot3=14\)
\(x=14:3\)
\(x=\frac{14}{3}\)
