x:y:z va x2-y2-z2=(-128)
K
Khách
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Z
13 tháng 8 2022
\(\left(x-3\right)^7=\left(x-3\right)^5\)
\(\Leftrightarrow\left(x-3\right)^7-\left(x-3\right)^5=0\)
\(\Leftrightarrow\left(x-3\right)^5\left[\left(x-3\right)^2-1\right]=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-3=0\\x-3=1\\x-3=-1\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=3\\x=4\\x=2\end{matrix}\right.\)
DT
0
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NH
0
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15 tháng 8 2022
đk x >= 0
\(\dfrac{\sqrt{x}+1}{\sqrt{x}-3}=\dfrac{\sqrt{x}-3+4}{\sqrt{x}-3}=1+\dfrac{4}{\sqrt{x}-3}\)
\(\Rightarrow\sqrt{x}-3\inƯ\left(4\right)=\left\{\pm1;\pm2;\pm4\right\}\)
\(\sqrt{x}-3\) | 1 | -1 | 2 | -2 | 4 | -4 |
x | 16 | 4 | 25 | 1 | 49 | loại |