Các bn giải nhanh hộ mình với mình cần luôn !
1, 18 : (-9) + 3 . (-2) + 15 ⋮ x - 1
2, 15 + x ⋮ x
3, x + 30 ⋮ x + 2
4, 2x - 5 ⋮ x - 1
5, x + 3 ⋮ 2x - 2
6, 3x + 2 ϵ Ư(24)
7, (x + 1) (y + 3) = -5
8, (x + 1) (xy + 3) = -5
9, (5x + 4) (y - 3) = 60
10, xy + 2x + y = 3
11, xy + 3x + y = 3
12, (x + y -1) (3x + 2) = x + 5
2: =>15 chia hết cho x
=>\(x\in\left\{1;-1;3;-3;5;-5;15;-15\right\}\)
3: =>28 chia hết cho x+2
=>\(x+2\in\left\{1;-1;2;-2;4;-4;7;-7;14;-14;28;-28\right\}\)
=>\(x\in\left\{-1;-3;0;-4;2;-6;5;-9;12;-16;26;-30\right\}\)
4: =>2x-2-3 chia hết cho x-1
=>\(x-1\in\left\{1;-1;3;-3\right\}\)
=>\(x\in\left\{2;0;4;-2\right\}\)
5: =>2x+6 chia hết cho 2x-2
=>2x-2+8chia hết cho 2x-2
=>\(2x-2\in\left\{1;-1;2;-2;4;-4;8;-8\right\}\)
=>\(x\in\left\{\dfrac{3}{2};\dfrac{1}{2};2;0;3;-1;5;-3\right\}\)
