mình sửa lại:
[imath]A= ( \dfrac{3}{2};\dfrac{5}{2} )[/imath]
[imath]B= ( 0;2 )[/imath]
[imath]A \cap B = ( \dfrac{3}{2}; 2 )[/imath]
[imath]A \cup B = ( 0;\dfrac{5}{2})[/imath]
A \ B = [imath]( 2;\dfrac{5}{2})[/imath]
B \ A = [imath]( 0;\dfrac{3}{2})[/imath]
[imath]N \cap B = 1[/imath]