B= (3x +2 )² + 2 (2+3x) (1-2y )+ (2 y -1)²
C= (x -y )² + 4xy
D= (6x -2 ) + 4 ( 3x -1) ( 2+y ) +(y+ 2)²
E= ( 5x+5 )² + 10( x-3 ) (1+x ) + x² - 6x +9
F= (x-1)²/4 +x²- 1+ (x+1)²
Loga
Sinh Học lớp 12
