Sagot :
Bonjour,
40x − (0, 5x3 − 4x+ 20x + 72)
= 40x -0,5x³ +4x -20x -72
= -0,5x³ +24x -72
40x − (0, 5x3 − 4x2 + 20x - 72)
= 40x -0,5x³ +4x² -20x +72
= -0,5x³ +4x² +20x +72
Bonjour,
-40x-(0,5x³-4x+20x+72)= -40x-(0.5x³+16x+72)= -40x-0.5x³-16x-72
= -0.5x³-56x+72
-40x-(0,5x³-4x²+20x-72)=-40x-0,5x³+4x²- 20x+72= -0.5x³+4x²-60x+72