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Sagot :

VINS

bonsoir

a .  2 x² +  x  - 2 x - 5 = 2 x² - x - 5

b . 20 x - 36 - 10 x² + 18 x = - 10 x² + 38 x - 36

c. - x² + x +x - 1  = - x² + 2 x - 1

d . 18 + 9 x + 12  x + 6 x² =  6 x² + 21 x + 18

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