bonjour
A=3 x -4 -7x-2+4 x-6
= - 12
B= -3 + 4x -9x² + 5x -2x²+6
= - 11 x² + 9 x + 3
C= 13x - x² + 12-7x + 3x²-4
= 2 x² + 6 x + 8
D=4x² – 5x + 9-3x - 7x²-2
= - 3 x² - 8 x + 7
E= 2x² - x + 4 - x² + 4x -5
= x² + 3 x - 1
F= - 3 + 2x + x² + x² - 5x + 4x²-1
= 6 x² - 3 x - 4
G= -6 × a × 3 × a × a - 4× a + 5 × b - 2 + 7 - 3 × b
= - 18 a ³ - 4 a + 5 b - 2 + 7 - 3 b
= - 18 a ³ - 4 a + 2 b + 5
