x= { x E N / 0
A;B C x
A giao B={ 4; 6; 9 }
A hợp { 3; 4; 5}={ 1;3;4;5;6;8;9}
B hợ...
Mathematics, 26.07.2021 15:00 abbbaayyyy1709
x= { x E N / 0
A;B C x
A giao B={ 4; 6; 9 }
A hợp { 3; 4; 5}={ 1;3;4;5;6;8;9}
B hợp { 4;8}= { 2;3;4;5;6;7;8;9}
tìm A=?
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