bonjour
A = 3 ( 2 x - 5 ) + 6 x²
= 6 x - 15 + 6 x²
B = 5 xy - x ( y + 2) x 4 + 11 y
= 5 x y - ( x y + 2 x ) x 4 + 11 y
= 5 x y - 4 xy + 8 x + 11 y
C = - 6 x + 2 x² + 44 + 12 x
= 2 x² + 6 x + 44
D = ( 6 x + 3 ) ( 2 x + 1 )
= 12 x² + 6 x + 6 x + 3
= 12 x² + 12 x + 3
E = 4 xy + 2 ( 6 x + 7 y ) - 3 xy
= 4 x y + 12 x + 14 y - 3 xy
= xy + 12 x + 14 y
