Question

Tim x thuoc Z:
a, -8 ⋮ 2x + 1
b, -54 ⋮ 4x - 1

Answer 1

a: \(\Leftrightarrow2x+1\in\left\{1;-1\right\}\)

hay \(x\in\left\{0;-1\right\}\)

Answer 2

a)Ư(-8)={1,2,4,8,-1,-2,-4,-8}
 

2x+1	1	2	4	8	-1	-2	-4	-8
x	0	0,5	1,5	3,5	-1	-1,5	-2.5	-4,5

b)Ư(-54)={-1,-2,-3,-6,-9,-18,-27,-54,1,2,3,6,9,18,27,54}

4x-1	-1	-2	-3	-6	-9	-18	-27	-54	1	2	3	6	9	18	27	54
x	0	-0.25	-0,5	-1,25	-2	-4,25	-6,25	-13,25	0.5	0.75	1	1,75	2,5	4,75	7	13,75