3 mũ x – 1 + 46 = 127 ║ x + 2 ║ – 13 = – 1 NHANH NHA MÌNH ĐANG CẦN GẤP 30/11/2021 Bởi Ariana 3 mũ x – 1 + 46 = 127 ║ x + 2 ║ – 13 = – 1 NHANH NHA MÌNH ĐANG CẦN GẤP
1) `3^(x-1)+46=127` `⇒3^(x-1)=127-46` `⇒3^(x-1)=81` `⇒3^(x-1)=3^4` `⇒x-1=4` `⇒x=5` 2) `|x+2|-13=-1` `⇒|x+2|=-1+13` `⇒|x+2|=12` `⇒`\(\left[ \begin{array}{l}x+2=12\\x+2=-12\end{array} \right.\) `⇒`\(\left[ \begin{array}{l}x=10\\x=-14\end{array} \right.\) Bình luận
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1)
`3^(x-1)+46=127`
`⇒3^(x-1)=127-46`
`⇒3^(x-1)=81`
`⇒3^(x-1)=3^4`
`⇒x-1=4`
`⇒x=5`
2)
`|x+2|-13=-1`
`⇒|x+2|=-1+13`
`⇒|x+2|=12`
`⇒`\(\left[ \begin{array}{l}x+2=12\\x+2=-12\end{array} \right.\)
`⇒`\(\left[ \begin{array}{l}x=10\\x=-14\end{array} \right.\)