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Đáp án `+` Giải thích các bước giải:

`A = {x in N | 150 \vdots x}`

`150 \vdots x => x in B(150) = {150;300;450;600;750;900;.....}`

`=> A = {150;300;450;600;750;900;.....}`

`B = {x in N | x \vdots 150}`

`x \vdots 150 => x in Ư(150) = {1;2;3;5;6;10;15;25;50;......;150}`

`=> B = {1;2;3;5;6;10;15;25;50;......;150}`