( 2x+1/3)-5/2=8/3 () la gia tri tuyet doi 06/09/2021 Bởi Aubrey ( 2x+1/3)-5/2=8/3 () la gia tri tuyet doi
\(\begin{array}{l}\left| {2x + \dfrac{1}{3}} \right| – \dfrac{5}{2} = \dfrac{8}{3}\\ \Rightarrow \left| {2x + \dfrac{1}{3}} \right| = \dfrac{8}{3} + \dfrac{5}{2}\\ \Rightarrow \left| {2x + \dfrac{1}{3}} \right| = \dfrac{{31}}{6}\\TH1:\,2x + \dfrac{1}{3} = \dfrac{{31}}{6}\\2x = \dfrac{{31}}{6} – \dfrac{1}{3}\\2x = \dfrac{{29}}{6}\\x = \dfrac{{29}}{{12}}\\TH2:2x + \dfrac{1}{3} = – \dfrac{{31}}{6}\\2x = – \dfrac{{31}}{6} – \dfrac{1}{3}\\2x = \dfrac{{ – 11}}{2}\\x = \dfrac{{ – 11}}{4}\end{array}\) Bình luận
Đáp án: Giải thích các bước giải: `|2x+1/3| -5/2=8/3` `|2x+1/3| = 8/3 + 5/2` `|2x+1/3| = 31/6` `2x+1/3 = 31/6` hoặc `2x+1/3 = -31/6` `2x = 31/6 – 1/3` `2x = -31/6 – 1/3` `2x = 29/6` `2x = -11/2` ` x = 29/6 : 2` `2x = -11/2 : 2` ` x = 29/12 2x = -11/4` Bình luận
\(\begin{array}{l}
\left| {2x + \dfrac{1}{3}} \right| – \dfrac{5}{2} = \dfrac{8}{3}\\
\Rightarrow \left| {2x + \dfrac{1}{3}} \right| = \dfrac{8}{3} + \dfrac{5}{2}\\
\Rightarrow \left| {2x + \dfrac{1}{3}} \right| = \dfrac{{31}}{6}\\
TH1:\,2x + \dfrac{1}{3} = \dfrac{{31}}{6}\\
2x = \dfrac{{31}}{6} – \dfrac{1}{3}\\
2x = \dfrac{{29}}{6}\\
x = \dfrac{{29}}{{12}}\\
TH2:2x + \dfrac{1}{3} = – \dfrac{{31}}{6}\\
2x = – \dfrac{{31}}{6} – \dfrac{1}{3}\\
2x = \dfrac{{ – 11}}{2}\\
x = \dfrac{{ – 11}}{4}
\end{array}\)
Đáp án:
Giải thích các bước giải:
`|2x+1/3| -5/2=8/3`
`|2x+1/3| = 8/3 + 5/2`
`|2x+1/3| = 31/6`
`2x+1/3 = 31/6` hoặc `2x+1/3 = -31/6`
`2x = 31/6 – 1/3` `2x = -31/6 – 1/3`
`2x = 29/6` `2x = -11/2`
` x = 29/6 : 2` `2x = -11/2 : 2`
` x = 29/12 2x = -11/4`