Bài 1: Tìm x,yez:
1, 15 - x + 17 = - (- 6 ) + | -12|
2, - |-5| - (-x ) + 4 = 3 - ( -25)
3, x - 5 chia hết cho x - 1
4,3x + 5 chia hết 2x - 1
5, |x| - 1 = 5
6, | x - 3 | - 2 . ( -4 ) = ( - 7 ) . ( - 12 )
7, 2 . | x + 2 | + 3 = 32 ( nếu các a/c ko ghi đc mũ thì ghi thường cx đc ạk )
NHờ cac a/c giúp e vs ạk
3, \(x-5⋮x-1\)
\(x-1-4⋮x-1\)
\(-4⋮x-1\Rightarrow x-1\inƯ\left(-4\right)=\left\{\pm1;\pm4\right\}\)
| x - 1 | 1 | -1 | 4 | -4 |
| x | 2 | 0 | 5 | -3 |
4,\(3x+5⋮2x-1\Leftrightarrow6x+10⋮2x+1\)
\(\Leftrightarrow3\left(2x+1\right)+7⋮2x+1\Leftrightarrow7⋮2x+1\)
\(\Rightarrow2x+1\inƯ\left(7\right)=\left\{\pm1;\pm7\right\}\)
| 2x + 1 | 1 | -1 | 7 | -7 |
| 2x | 0 | -2 | 6 | -8 |
| x | 0 | -1 | 3 | -4 |
