Question

[Giang Đông Tiêu (cá mặn)]

x⁞18, x⁞32 và 210<x≤1440

cứu me!!! *bí quá*

Answer 1

[Nguyễn Tuấn Tú]

Ta có:
\(\text{+)}x⋮18;x⋮32\\ \Rightarrow x\in BC\left(18,32\right)\)

\(\text{+)}18=2.3^2;32=2^5\\ \Rightarrow BCNN\left(18,32\right)=2^5.3^2=32.9=288\)

Suy ra:
\(x\in B\left(288\right)=\left\{0,288,576,864,1152,1440,1728,...\right\}\)
Mà \(210< x\le1440\) nên:
\(x\in\left\{288,576,864,1152,1440\right\}\)
Vậy \(x\in\left\{288,576,864,1152,1440\right\}\)