Tìm x biết:
5x.(x-1)=x-1
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b: \(\Leftrightarrow x\left(x-25\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=25\end{matrix}\right.\)
c: \(\Leftrightarrow\left(x-1\right)\left(5x-1\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{1}{5}\end{matrix}\right.\)
\(b,\Leftrightarrow x\left(x-25\right)=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=25\end{matrix}\right.\\ c,\Leftrightarrow\left(x-1\right)\left(5x-1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{1}{5}\end{matrix}\right.\)
5x(x – 1) = x – 1
⇔ 5x(x – 1) – (x – 1) = 0
⇔ (5x – 1)(x – 1) = 0
⇔ 5x – 1 = 0 hoặc x – 1 = 0
• x – 1 = 0 ⇔ x = 1
• 5x – 1 = 0 ⇔ x = 1/5
Vậy x = 1 hoặc x = 1/5.
a) 5x(x - 1) = x - 1
5x(x - 1) - (x - 1) = 0
(x - 1) (5x - 1) = 0
TH1: x - 1 = 0
x = 1
TH2: 5x - 1 = 0
5x = 1
x = 1/5
Vay x = 1 hoac x = 1/5.
b) 2(x + 5) - x2 - 5x = 0
2(x + 5) - x(x + 5) = 0
(x + 5) (2 - x) = 0
TH1: x + 5 = 0
x = -5
TH2: 2 - x = 0
x = 2
Vay x = -5 hoac x = 2
`5x(x-3)=(x-2)(5x-1)-5`
`\rightarrow 5x^2-15x= [x(5x-1)-2(5x-1)-5]`
`\rightarrow 5x^2-15x=(5x^2-x-10x+2-5)`
`\rightarrow 5x^2-15x=5x^2-11x-3`
`\rightarrow 5x^2-15x-5x^2+11x+3=0`
`\rightarrow -4x+3=0`
`\rightarrow 4x=3`
`\rightarrow x=`\(\dfrac{3}{4}\)
Vậy, `x=`\(\dfrac{3}{4}\)
Còn biến `y` thì mình k thấy bạn nhé!
Cho mk sửa lại từ dòng thứ 6 (tính cả đề)
`\rightarrow -4x+3=0`
`\rightarrow -4x=-3`
`\rightarrow x=-3/-4`
`\rightarrow x=3/4`
Vậy, `x=3/4`
a) \(5x\left(x-1\right)=x-1\)
\(\Rightarrow5x\left(x-1\right)-\left(x-1\right)=0\)
\(\Rightarrow\left(x-1\right).\left(5x-1\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-1=0\\5x-1=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=1\\x=\frac{1}{5}\end{cases}}\)
Vậy \(x=1\) hoặc \(x=\frac{1}{5}\)
b) \(2\left(x+5\right)-x^2-5x\)
\(\Rightarrow2\left(x+5\right)-x\left(x+5\right)\)
\(\Rightarrow\left(x+5\right).\left(2-x\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x+5=0\\2-x=0\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=-5\\x=2\end{cases}}\)
Vậy \(x=-5\)hoặc \(x=2\)
a, \(-4x+5+2x-1=3\Leftrightarrow-2x=-1\Leftrightarrow x=\dfrac{1}{2}\)
b, \(-2x+2=2\Leftrightarrow x=0\)
c, \(-2x-6=-8\Leftrightarrow x=1\)
\(5x.\left(x-1\right)=x-1\)
\(5x.\left(x-1\right)-\left(x-1\right)=0\)
\(\left(x-1\right).\left(5x-1\right)=0\)
=> \(\orbr{\begin{cases}x-1=0\\5x-1=0\end{cases}}\)=> \(\orbr{\begin{cases}x=1\\5x=1\end{cases}}\)=> \(\orbr{\begin{cases}x=1\\x=\frac{1}{5}\end{cases}}\)
\(5x\left(x-1\right)=x-1\)
\(\Leftrightarrow5x\left(x-1\right)-\left(x-1\right)=0\)
\(\Leftrightarrow\left(x-1\right)\left(5x-1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-1=0\\5x-1=0\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=1\\5x=1\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=1\\x=\frac{1}{5}\end{cases}}\)
Vậy \(x\in\left\{1;\frac{1}{5}\right\}\)