\(a,3\left(x+1\right)-2=4\)
\(\Leftrightarrow3\left(x+1\right)=6\)
\(\Leftrightarrow x+1=2\)
\(\Leftrightarrow x=1\)
Vậy x=1
Các câu còn lại lm tương tự nhé
\(3\left(x+1\right)-2=4\)
<=> \(3x+3-2=4\)
<=> \(3x=3\)
<=> \(x=1\)
\(5\left(x-2\right)+20=45\)
<=> \(5x-10=25\)
<=> \(x=7\)
\(700-7\left(x+2\right)=140\)
<=> \(7x+14=560\)
<=> \(7x=546\)
<=> \(x=78\)
\(200-5\left(2x+4\right)=100\)
<=> \(10x+20=100\)
<=> \(x=8\)
\(5\left(2x-4\right)+150=250\)
<=> \(10x-20=100\)
<=> \(x=12\)
học tốt
a) 3(x + 1) - 2 = 4 b) 5(x-2) + 20 = 45 c ) 700 - 7 ( x + 2 ) = 140 d) 200 - 5 ( 2x +4 ) = 100
3(x + 1 ) = 4 + 2 5 ( x -2 ) = 45 - 20 7 ( x + 2 ) = 700 - 140 5 ( 2x + 4 ) = 200 - 100
3( x + 1 ) = 6 5 ( x - 2 ) = 25 7 ( x + 2 ) = 560 5 ( 2x + 4 ) = 100
x + 1 = 6 : 3 x - 2 = 25 : 5 x + 2 = 560 : 7 ( 2x + 4 ) = 100 : 5
x + 1 = 2 x - 2 = 5 x + 2 = 80 ( 2x + 4 ) = 20
x = 2 - 1 x = 5 + 2 x = 80 - 2 2x = 20 - 4
x = 1 x = 7 x = 78 2x = 16
Vậy x = 1 Vậy x = 7 Vậy x = 78 => x = 8
vậy x = 8
e) 5 ( 2x - 4 ) + 150 = 250
5 ( 2x - 4 ) = 250 - 150
5 ( 2x - 4 ) = 100
2x - 4 = 100 : 5
2x - 4 = 20
2x = 20 + 4
2x = 24
=> x = 12
Vậy x = 12
