3: "c" equals left parenthesis, "x" Subscript, 1 , Baseline left bracket, 3 , right bracket , "y" Subscript, 1 , Baseline left bracket, 3 , right bracket , right parenthesisc=x13,y13
ป้ายกำกับ:
equals=
left parenthesis, 2 , 2 , right parenthesis2,2
8
4: "d" equals left parenthesis, "x" Subscript, 1 , Baseline left bracket, 4 , right bracket , "y" Subscript, 1 , Baseline left bracket, 4 , right bracket , right parenthesisd=x14,y14
