Sagot :
A = 7/3 (6x-3 )
A = 7/3x6 x + 7/3 x -3
A = 14x - 7
B = 4y x y + 4y x -1 -5y + 5
B = 4y² - 4y - 5y + 5
B = 4y² -9y + 5
C =3t² + 3t + 5t -10 + t² -2t
C = 4t² + 6t - 10
B= ( 4y - 5 )( y - 1 )
= 4y x y + 4y x (-1) - 5 x y + 5 x (-1)
= 4y^2 -4y - 5y + (-5)
= 4y^2 -9y +5