Help more please ????????????(tăng điểm) 3/x+2=5/2x+1 17/09/2021 Bởi Quinn Help more please ????????????(tăng điểm) 3/x+2=5/2x+1
$\text { Đáp án: }$ $\frac {3}{x+2}$ ` = ` $\frac {5}{2x+1}$ $\text { (đk: x khác –2 ; }$ $\frac {‐1}{2}$ $\text { ) }$ ` => 3(2x + 1) = 5(x + 2) ` ` => 6x + 3 = 5x + 10 ` ` => 6x – 5x = 10 – 3 ` ` => x = 7 ` $\text { Vậy }$ ` x = 7 ` Bình luận
ĐK: $x\neq -2; x\neq \frac{-1}{2}$ $\dfrac{3}{x+2}=\dfrac{5}{2x+1}$ $\Rightarrow 3(2x+1)=5(x+2)$ $\Leftrightarrow 6x+3=5x+10$ $\Leftrightarrow 6x-5x=10-3$ $\Leftrightarrow x=7$ (TM) Vậy $S= \{ 7\}$ Bình luận
$\text { Đáp án: }$
$\frac {3}{x+2}$ ` = ` $\frac {5}{2x+1}$ $\text { (đk: x khác –2 ; }$ $\frac {‐1}{2}$ $\text { ) }$
` => 3(2x + 1) = 5(x + 2) `
` => 6x + 3 = 5x + 10 `
` => 6x – 5x = 10 – 3 `
` => x = 7 `
$\text { Vậy }$ ` x = 7 `
ĐK: $x\neq -2; x\neq \frac{-1}{2}$
$\dfrac{3}{x+2}=\dfrac{5}{2x+1}$
$\Rightarrow 3(2x+1)=5(x+2)$
$\Leftrightarrow 6x+3=5x+10$
$\Leftrightarrow 6x-5x=10-3$
$\Leftrightarrow x=7$ (TM)
Vậy $S= \{ 7\}$