Tìm x: a) x + 4/15 = -3/10 b) ( 2x + 1/2 ) ( 4/5 -x ) = 0 Giúp mình với ạ mình cần gấp ;-; 11/11/2021 Bởi Iris Tìm x: a) x + 4/15 = -3/10 b) ( 2x + 1/2 ) ( 4/5 -x ) = 0 Giúp mình với ạ mình cần gấp ;-;
a) `x + 4/15 = -3/10` `x=-3/10 – 4/5` `x=-11/10` b) `( 2x + 1/2 ) ( 4/5 -x ) = 0 ` `2x+1/2 =0` hoặc `4/5 -x=0` `2x=-1/2` hoặc `x=4/5` `x=-1/4` hoặc `x=4/5` Bình luận
Đáp án: $\text{a) x + $\dfrac{4}{15}$ = $\dfrac{-3}{10}$}$ $\text{ => x = $\dfrac{-3}{10}$ – $\dfrac{4}{15}$}$ $\text{=> x = $\dfrac{-17}{30}$}$ $\text{Vậy x= $\dfrac{-17}{30}$}$ $\text{b) (2x+$\dfrac{1}{2}$) ($\dfrac{4}{5}$ – x ) =0}$ $\text{=>\(\left[ \begin{array}{l}2x+\dfrac{1}{2}=0\\\dfrac{4}{5} – x =0\end{array} \right.\) }$ $\text{=>\(\left[ \begin{array}{l}x=\dfrac{-1}{4}\\x=\dfrac{4}{5}\end{array} \right.\) }$ Vậy x= { $\dfrac{-1}{4}$ ; $\dfrac{4}{5}$} Bình luận
a) `x + 4/15 = -3/10`
`x=-3/10 – 4/5`
`x=-11/10`
b) `( 2x + 1/2 ) ( 4/5 -x ) = 0 `
`2x+1/2 =0` hoặc `4/5 -x=0`
`2x=-1/2` hoặc `x=4/5`
`x=-1/4` hoặc `x=4/5`
Đáp án:
$\text{a) x + $\dfrac{4}{15}$ = $\dfrac{-3}{10}$}$
$\text{ => x = $\dfrac{-3}{10}$ – $\dfrac{4}{15}$}$
$\text{=> x = $\dfrac{-17}{30}$}$
$\text{Vậy x= $\dfrac{-17}{30}$}$
$\text{b) (2x+$\dfrac{1}{2}$) ($\dfrac{4}{5}$ – x ) =0}$
$\text{=>\(\left[ \begin{array}{l}2x+\dfrac{1}{2}=0\\\dfrac{4}{5} – x =0\end{array} \right.\) }$
$\text{=>\(\left[ \begin{array}{l}x=\dfrac{-1}{4}\\x=\dfrac{4}{5}\end{array} \right.\) }$
Vậy x= { $\dfrac{-1}{4}$ ; $\dfrac{4}{5}$}