Sagot :
bonjour
A = x² + 6 x - x = x² + 5 x
C = 3 x² + 12 x - 6 x² = - 3 x² + 12 x
B = xy - 2 x + xy = - 2 x + 2 xy
D = 9 x ³ - 54 x + 2x²
E = 15 x + 25 x² + 5 x + x² + 8 x² + 4 x = 34 x² + 29 x
Bonjour,
A= x(x + 6) - x
= x² +6x -x
= x² +5x
C= 3x(x + 4) - 6x²
= 3x² +12x -6x²
= -3x² +12x
B = x(y-2) + xy
= xy - 2x +xy
= 2xy -2x
D = 9x(x² - 6) + 2x²
= 9x³ -54x +2x²
= 9x³ +2x² -54x
E = 5x(3 + 5x) + x(5 + x) + 4x(2x + 1)
= 15x +25x²+5x +x² +8x² +4x
= 34x² +24x