\(86:\left[2\left(2x-1\right)^2-7\right]+4^2=2.3^2\)
\(\Rightarrow86:\left[2\left(2x-1\right)^2-7\right]=18-16=2\)
\(2\left(2x-1\right)^2-7=86:2=43\)
\(\Rightarrow\left(2x-1\right)^2=25\)
\(\Rightarrow\orbr{\begin{cases}2x-1=5\Leftrightarrow x=3\\2x-1=-5\Leftrightarrow x=-2\end{cases}}\)
Tìm x thuộc Z biết:
86 : [ 2 . ( 2x - 1 )^2 - 7 ] + 4^2 = 2 . 3^2
86:[2.(2x-1)2-7]+42=2.32
86:[2.(2x-1)2-7]+42=2.32
86:[2.(2x-1)2-7]+42=2.32
86:(2.(2x-1)2-7)+42=2.32
tìm x thuộc Z biết
a, (/x/ +3 ):5-3 =12
b, 86 : [2.(2x - 1 )2 - 7] +42 = 2.32
a. ( | x | + 3 ) . 15 - 5 = 70
b. 86 : [ 2. (2x -1)2 - 7 ] + 42 = 2 .32
- Tìm x
86: [2. (2x - 1)2 – 7] + 42 = 2.32
1. [|x| + 3 ] . 15 - 5 = 70
2. 86 : { 2. [ 2x - 1 ]2 - 7 } + 42 = 2. 32
3. 20 - { 42 + [ x - 6 }] = 90
4. 24- |x + 8| = 3. [25 - 52 ]
5. 1000 : [ 30 + { 2x - 6 }] = 32 + 42
6. [ x + 1 ] chia hết [ x + 2 ] và x thuộc N
