Question

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

Answer 1

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

=>\(2x-2\in\left\{1;-1;2;-2;4;-4;8;-8\right\}\)

=>\(x\in\left\{\dfrac{3}{2};\dfrac{1}{2};2;0;3;-1;5;-3\right\}\)