a, A = { a; b }
B = { a; c }
C = { b; c }
b, A < M
B < M
C < M
a) A = a;b
B = a;c
C = b;c
b) A < M
B < M
C < M
Theo mk nghĩ là z
Tk mk nha!!!
a)
\(A=\left\{a,b\right\}\)
\(B=\left\{a,c\right\}\)
\(C=\left\{b,c\right\}\)
b)
\(A\subset M\)
\(B\subset M\)
\(C\subset M\)