a) Ư(8) = {1;2;4;8}; Ư(12) = {1;2;3;4;6;12} => ƯC(8;12) = {1;2;4;}
b) Ư(24) = {1;2;3;4;6;8;12;24}; Ư(32) = {1;2;4;8;16;32} => ƯC(24; 32) = {1;2;4;8;}
c) Ư(7) = {1;7} ; Ư(10) = {1;2;5;10} => ƯC(7;10) = {1}
d) 8 = 23; 10 = 2.5 => BCNN (8;10) = 23.5 = 40 => BC(8;10) = B(40) = {0;40;80;...}
e) 25 = 52 => BCNN(2;3;25) = 2.3.52 = 150 => BC (2;3;25) = B(150) = {0;150; 300; ...}
2) N = {0;1;2;3;...}; N* = {1;2;3;....} => N giao N* = {1;2;3;...} = N*
a) Ư(8) = {1;2;4;8}; Ư(12) = {1;2;3;4;6;12} => ƯC(8;12) = {1;2;4;}
Vâu b,c,d,e tương tự nha bn
2) N = {0;1;2;3;...}; N* = {1;2;3;....} => N giao N* = {1;2;3;...} = N*
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