(−53).x2=−1125. cíu với mn ơi...
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. cíu với mn ơi pls
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Đỗ Thanh Hải
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1 lived
2 wasn't hearing - was thinking
3 walked - was
4 were you doing - phoned
5 was reading - heard
6 was walking - saw
7 had watched - wrote
8 met
9 had you done - moved
10 was - didn't attend
II
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2 had read the instruction, I started the machine
3 went out for a rest, we had finished our assignment
4 she left, it was raining
5 learning English
6 to help me
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HQ
Hà Quang Minh
Giáo viên
20 tháng 8 2023
\(2\cdot3^x-1=53\\ \Leftrightarrow2\cdot3^x=54\\ \Leftrightarrow3^x=27\\ \Leftrightarrow x=3\)
cíu bé vs mn ơi
Y
6 tháng 10 2023
\(A=\left\{x\in Z|\left(x^2-9\right)\left(x^2-7\right)\left(3x+5\right)=0\right\}\)
Giải pt \(\left(x^2-9\right)\left(x^2-7\right)\left(3x+5\right)=0\) \(\left(dk:x\in Z\right)\)
\(\Leftrightarrow\left[{}\begin{matrix}x^2-9=0\\x^2-7=0\\3x+5=0\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x=\pm3\left(tm\right)\\x=\pm\sqrt{7}\left(ktm\right)\\x=-\dfrac{5}{3}\left(ktm\right)\end{matrix}\right.\)
Vậy \(A=\left\{-3;3\right\}\)
Cíu mình dới mn ơi huhu
DM
1
(-5)3.\(x^2\) = - 1125
\(x^2\) = (-1125) : (-53)
\(x^2\) = 9
\(\left[{}\begin{matrix}x=-3\\x=3\end{matrix}\right.\)
Vậy \(x\) \(\in\) {-3; 3}
\(\left(-5\right)^3.x^2=-1125\)
\(x^2=-1125:\left(-5\right)^3\)
\(x^2=-1125:\left(-125\right)\)
\(x^2=9\)
\(x^2=3^2\)
\(\Rightarrow\left\{{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\)
⇒ Vậy \(x\in\left\{{}\begin{matrix}3\\-3\end{matrix}\right.\)