All questions
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Sarah Marianna 01/08/2019 at 04:40Câu hỏi : Vừa bằng hạt đỗ , ăn giỗ cả làng . Là con gì ?
Câu trả lời : Là con ruồi .
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Kinnen 19/11/2019 at 12:10Là con ruồi , nhé bạn
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Trần Bảo Nam 28/07/2019 at 23:40Pa sếc
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Nhé bạn .
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William1 24/08/2019 at 13:16
hehe boi , can u solve ?
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Quy Nguyen 02/07/2019 at 08:37
help me
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Trần Bảo Nam 28/07/2019 at 23:37
It's too hard
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Trần Bảo Nam 28/07/2019 at 12:38
\(18:\dfrac{1}{3}=6\)
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lê đức anh 09/01/2020 at 12:5518x1/3=6
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Vu Minh Anh 29/10/2019 at 12:10
1/3 của 18 = 18/3=6
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Nguyễn Linh Chi 08/08/2019 at 09:44
\(f\left(a\right)=\sqrt{25a^2-30a+9}\)
\(g\left(a\right)=a\)
We have the following:
\(f\left(a\right)=g\left(a\right)+7\)
\(\Leftrightarrow\sqrt{25a^2-30a+9}=a+7\)
\(\Leftrightarrow\left\{{}\begin{matrix}25a^2-30a+9=\left(a+7\right)^2\\a+7\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a\ge-7\\24a^2-44a-40=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a\ge-7\\\left[{}\begin{matrix}a=\dfrac{5}{2}\\a=-\dfrac{2}{3}\end{matrix}\right.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}a=\dfrac{5}{2}\\a=-\dfrac{2}{3}\end{matrix}\right.\)
Finally, there are two values of a.
Uchiha Sasuke selected this answer.
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Lux Arcadia 14/06/2019 at 14:20
\(\dfrac{n-17}{n+23}=\dfrac{n+23-40}{n+23}=1-\dfrac{40}{n+23}\)
\(\Rightarrow\left\{{}\begin{matrix}40⋮\left(n+23\right)\\n+23\ge23\left(n\ge0\right)\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}\left(n+23\right)\in\left\{1;2;4;5;8;10;20;40\right\}\\n+23\ge23\end{matrix}\right.\)
\(\Leftrightarrow n+23=40\Leftrightarrow n=17\)
