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Sagot :

MEYSIE
B= -5a-2a²
D= (2a+1) + 4a² + 6 - (-3a²+a)
 = 2a+1 + 4a² + 6 - 3a² - a
 = a + 7 + a²
F= 4x - x² - (5 - 2x) + (6x²-7)
= 4x - x² - (-5) + 2x + 6x² - 7
=6x+5x²+5-7
= 6x+5x²-2

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