giúp tớ với a/ 2x=x+3 b/-x=2x+4 c/2x+9=-x d/3x-2=2x-3 e/3x-2=14-x 11/07/2021 Bởi Madeline giúp tớ với a/ 2x=x+3 b/-x=2x+4 c/2x+9=-x d/3x-2=2x-3 e/3x-2=14-x
a) $2x = x + 3$ $\Leftrightarrow x = 3$ b) $-x = 2x + 4$ $\Leftrightarrow -3x = 4$ $\Leftrightarrow x = -\frac{4}{3}$ c) $2x + 9 = -x$ $\Leftrightarrow 3x = 9$ $\Leftrightarrow x = 3$ d) $3x – 2 = 2x – 3$ $\Leftrightarrow x = -1$ e) $3x – 2 = 14 – x$ $\Leftrightarrow 4x = 16$ $\Leftrightarrow x = 4$ Bình luận
Bạn tham khảo nhé a) 2x = x + 3 <=> 2x – x = 3 <=> x = 3 Vậy x = 3 b) -x = 2x + 4 <=> -x – 2x = 4 <=> -3x = 4 <=> x = -$\frac{4}{3}$ Vậy x = -$\frac{4}{3}$ c) 2x + 9 = -x <=> 2x + x = -9 <=> 3x = -9 <=> x = -3 Vậy x = -3 d) 3x – 2 = 2x – 3 <=> 3x – 2x = -3 + 2 <=> x = -1 Vậy x = -1 e) 3x – 2 = 14 – x <=> 3x + x = 14 + 2 <=> 4x = 16 <=> x = 4 Vậy x = 4 Bình luận
a) $2x = x + 3$
$\Leftrightarrow x = 3$
b) $-x = 2x + 4$
$\Leftrightarrow -3x = 4$
$\Leftrightarrow x = -\frac{4}{3}$
c) $2x + 9 = -x$
$\Leftrightarrow 3x = 9$
$\Leftrightarrow x = 3$
d) $3x – 2 = 2x – 3$
$\Leftrightarrow x = -1$
e) $3x – 2 = 14 – x$
$\Leftrightarrow 4x = 16$
$\Leftrightarrow x = 4$
Bạn tham khảo nhé
a) 2x = x + 3
<=> 2x – x = 3
<=> x = 3
Vậy x = 3
b) -x = 2x + 4
<=> -x – 2x = 4
<=> -3x = 4
<=> x = -$\frac{4}{3}$
Vậy x = -$\frac{4}{3}$
c) 2x + 9 = -x
<=> 2x + x = -9
<=> 3x = -9
<=> x = -3
Vậy x = -3
d) 3x – 2 = 2x – 3
<=> 3x – 2x = -3 + 2
<=> x = -1
Vậy x = -1
e) 3x – 2 = 14 – x
<=> 3x + x = 14 + 2
<=> 4x = 16
<=> x = 4
Vậy x = 4