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(8x-16)(x-5)=0
=>8x-16=0 hoặc x-5=0
=>x=2 hoặc x=5.
Chúc bạn học tốt nhé
\(\left(8x-16\right)\left(x-5\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}8x-16=0\\x-5=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}8x=16\\x=5\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\)
`(8x-16)(x-5)=0`
`=>8x-16=0` hoặc `x-5=0`
`=>8x=16` hoặc `x=5`
`=>x=16:8` hoặc `x=5`
`=>x=2` hoặc `x=5`
Vậy `x in{2;5}`
TH1: 8x-16=0 8x =0+16 8x =16 x =16:8 x =2 | TH2: x-5=0 x=0+5 x=5 |
\(\Rightarrow\left[{}\begin{matrix}8x-16=0\\x-5=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\)
\(\left(8x-16\right)\left(x-5\right)=0\\ \Leftrightarrow8\left(x-2\right)\left(x-5\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x-2=0\\x-5=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\)
(8\(x\) - 16).(\(x\) - 5) = 0
\(\left[{}\begin{matrix}8x-16=0\\x-5=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}8x=16\\x-5=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\)
Vậy \(x\) \(\in\){2; 5}
\(\left(8x-6\right)\left(x-5\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}8x-16=0\\x-5=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=5\end{matrix}\right.\)
8x -16(x-5)=0
8x-16x+80=0
8x - 16x=0-80
x.(8-16)=-80
x.(-8)=-80
x=-80:(-8)
x=10
Vậy x=10
a, \(x\) + 99: 3 = 55
\(x\) + 33 = 55
\(x\) = 55 - 33
\(x\) = 22
b, (\(x\) - 25):15 = 20
\(x\) - 25 = 20 x 15
\(x\) - 25 = 300
\(x\) = 300 + 25
\(x\) = 325
c, (3\(x\) - 15).7 = 42
3\(x\) - 15 = 42:7
3\(x\) - 15 = 6
3\(x\) = 6 + 15
3\(x\) = 21
\(x\) = 21: 3
\(x\) = 7
`@` `\text {Ans}`
`\downarrow`
\(\left(8x-16\right)\cdot\left(x-4^3\right)=0\)
\(\Rightarrow\) \(\left[{}\begin{matrix}8x-16=0\\x-4^3=0\end{matrix}\right.\)
`\Rightarrow`\(\left[{}\begin{matrix}8x=16\\x=64+0\end{matrix}\right.\)
`\Rightarrow`\(\left[{}\begin{matrix}x=16\div8\\x=64\end{matrix}\right.\)
`\Rightarrow`\(\left[{}\begin{matrix}x=2\\x=64\end{matrix}\right.\)
Vậy, \(x\in\left\{2;64\right\}\)
(8\(x\) -16)(\(x-4^3\)) = 0
\(\left[{}\begin{matrix}8x-16=0\\x-4^3=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}8x=16\\x=64\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=2\\x=64\end{matrix}\right.\)
Vậy \(x\in\) { 2; 64}
11
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