||x-1|+3|=7 tim x
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\left(x-1\right)\left(3x-7\right)=\left(x-1\right)\left(x+3\right)\)
\(\Leftrightarrow\left(x+1\right)\left(3x-7\right)-\left(x+1\right)\left(x+3\right)=0\)
\(\Leftrightarrow\left(x+1\right)\left(\left(3x-7\right)-\left(x+3\right)\right)=0\)
\(\Leftrightarrow\left(x+1\right)\left(3x-7-x-3\right)=0\)
\(\Leftrightarrow\left(x+1\right)\left(2x-10\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x+1=0\\2x-10=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=-1\\x=5\end{cases}}\)
(x-1)(3X-7)=(x-1)(x+3)
=>(x-1)(3x-7)-(x-1)(x+3)=0
=>(x-1)(3x-7-x-3)=0
=>(x-1)(2x-10)=0
=> + x-1=0 =>x=1
+ 2x-10=0 =>x=5
1 / 5 + x = 3 / 7 + 1 / 3
1 / 5 + x = 16 /21
x = 16 / 21 - 1 / 5
x = 59 / 105
x - 1 / 2 = 2 / 3 - 1 / 5
x - 1 / 2 = 7 / 15
x = 7 / 15 + 1 / 2
x = 29 / 30
3 / 5 * x = 2 / 7+ 1 / 4
3 / 5 * x = 15 / 28
x = 15 / 28 : 3 / 5
x = 25 / 28
7 / 8 : x = 1 / 6 * 2 / 3
7 / 8 : x = 1 / 9
x = 7 / 8 : 1 / 9
x = 63 / 8
-x-2/3=-6/7
=>-x=-6/7+(-2/3)
=>-x=-32/21
=>x=32/21
4/7-x=1/3
=>x=4/7-1/3
=>x=5/21
-x-2/3=-6/7
=>-x=-6/7+(-2/3)
=>-x=-32/21
=>x=32/21
4/7-x=1/3
=>x=4/7-1/3
=>x=5/21
\(x+\dfrac{1}{5}=\dfrac{6}{35}+\dfrac{3}{7}\)
\(x+\dfrac{1}{5}=\dfrac{3}{5}\)
\(x=\dfrac{3}{5}-\dfrac{1}{5}\)
\(x=\dfrac{2}{5}\)
| |x-1| + 3 |=7
\(\Leftrightarrow\orbr{\begin{cases}\left|x-1\right|+3=7\\\left|x-1\right|+3=-7\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}\left|x-1\right|=4\\\left|x-1\right|=-10\end{cases}}\)
vì |x-1| \(\ge\)0
\(\Rightarrow\left|x-1\right|=-10\left(L\right)\)
|x-1| = 4
\(\Leftrightarrow\orbr{\begin{cases}x-1=4\\x-1=-4\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}x=5\\x=-3\end{cases}}\)
vậy x = 5 or x=-3
#mã mã#