a) 4x – 10 = 0
b) 2x + x +12 = 0
c) x – 5 = 3 – x
d) 2x – (3 – 5x) = 4( x +3)
e) 2t – 3 + 5t = 4t + 12
f) 3- 4x + 24 + 6x = x + 27 + 3x
a) 4x – 10 = 0
b) 2x + x +12 = 0
c) x – 5 = 3 – x
d) 2x – (3 – 5x) = 4( x +3)
e) 2t – 3 + 5t = 4t + 12
f) 3- 4x + 24 + 6x = x + 27 + 3x
a) $4x – 10 = 0$
⇔ $2( 2x – 5 ) = 0$
⇔ $2x – 5 = 0$
⇔ $x = \dfrac{5}{2}$
$S =$ { $\dfrac{5}{2}$ }
b) $2x + x + 12 = 0$
⇔ $3x = -12$
⇔ $x = -4$
$S =$ { $-4$ }
c) $x – 5 = 3 – x$
⇔ $x + x = 3 + 5$
⇔ $2x = 8$
⇔ $x = 4$
$S =$ { $4$ }
d) $2x – ( 3 – 5x ) = 4( x +3)$
⇔ $2x – 3 + 5x = 4x + 12$
⇔ $7x – 4x = 12 + 3$
⇔ $3x = 15$
⇔ $x = 5$
$S =$ { $5$ }
e)$ 2t – 3 + 5t = 4t + 12$
⇔ $7t -4t = 12 + 3$
⇔ $3t = 15$
⇔ $t = 5$
$S =$ { $5$ }
f) $3 – 4x + 24 + 6x = x + 27 + 3x$
⇔ $-4x + 6x – 3x – x = 27 -3-24$
⇔ $-x = 0$
⇔ $x= 0$
$S =$ { $0$ }
a) 4x – 10 = 0
2 (2x – 5) = 0
4x = 10
2x = 5
x = 5/2
b) 2x + x + 12 = 0
3 (x + 4) = 0
3x + 12 = 0
3x = -12
x = -4
c) x – 5 = 3 – x
x – 5 = -(x – 3)
2x = 8
x = 4
d) 2x – (3 – 5x) = 4 (x + 3)
7x – 3 = 4 (x + 3)
7x – 3 = 4x + 12
3x = 15
x = 5
e) 2t – 3 + 5t = 4t + 12
7t – 4t = 12 + 3
3t = 15
t = 5
f) 3 – 4x + 24 + 6x = x + 27 + 3x
2x + 27 = 4x + 27
-2x = 0
x = 0
Chúc bạn học tốt !!!