A = {19 ; 20}
B = {1 ; 2 ; 3}
C = {35 ; 36 ; 37 ; 38}
\(A=\left\{19;20\right\}\)
\(B=\left\{1;2;3\right\}\)
\(C=\left\{35;36;37;38\right\}\)
\(A=\left\{19;20\right\}\)
\(B=\left\{1;2;3\right\}\)
\(C=\left\{35;36;37;38\right\}\)
k mk nha Nguyen Quynh mai