Question

(x - 1) ∈ BC(4 ; 5 ; 6) và x < 250

Answer 1

\(\Rightarrow x-1\in B\left(60\right)=\left\{0;60;120;240;360;...\right\}\\ \Rightarrow x\in\left\{1;61;121;241\right\}\left(x< 250\right)\)

Answer 2

Ta có : 

BC(4,5,6) = 60 , 120 , 180 , ...

=> x - 1 = 60 , 120 , 180 , 240 , ...

=> x = 61 , 121 , 181 , 241 , ...

Mà x < 250 => x = 61 , 121 , 181 , 241