Question

[Mai Duong]

giải chi tiết hộ mik nhé

Answer 1

[Nguyễn Lê Phước Thịnh]

Bài 5: 

a) Ta có: \(x⋮5\)

\(\Leftrightarrow x\in B\left(5\right)\)

\(\Leftrightarrow x\in\left\{....;-15;-10;-5;0;5;10;15;...\right\}\)

mà -12<x<12

nên \(x\in\left\{-10;-5;0;5;10\right\}\)

Vậy: \(x\in\left\{-10;-5;0;5;10\right\}\)

b) Ta có: \(36⋮x\)

\(\Leftrightarrow x\inƯ\left(36\right)\)

\(\Leftrightarrow x\in\left\{-36;-18;-12;-9;-6;-4;-3;-2;-1;1;2;3;4;6;9;12;18;36\right\}\)

mà x<0

nên \(x\in\left\{-36;-18;-12;-9;-6;-4;-3;-2;-1\right\}\)

Vậy: \(x\in\left\{-36;-18;-12;-9;-6;-4;-3;-2;-1\right\}\)

Bài 6: 

a) Ta có: \(-24\cdot x=72\)

\(\Leftrightarrow x=72:\left(-24\right)\)

\(\Leftrightarrow x=-72:24=-3\)

Vậy: x=3

b) Ta có: \(-5\cdot\left|x\right|=-30\)

\(\Leftrightarrow\left|x\right|=6\)

hay \(x\in\left\{6;-6\right\}\)

Vậy: \(x\in\left\{6;-6\right\}\)

c) Ta có: \(12\cdot x=\left(-36\right)\)

\(\Leftrightarrow x=-36:12\)

\(\Leftrightarrow x=-3\)

Vậy: x=-3

d) Ta có: \(-8\cdot\left|x\right|=-32\)

\(\Leftrightarrow\left|x\right|=4\)

hay \(x\in\left\{4;-4\right\}\)

Vậy: \(x\in\left\{4;-4\right\}\)