Compléter les égalités suivantes. a. (4x + ...)(2x + 5) = ...x² + ...x + 15
b. (6x + ...)(...x - 2) = 18x² + ...x - 14
C. (3x - ...)(...x + 2) = 15x² - ...x - 18
d. (...x - 4)(-2x - ...) = ...x² - 34x + 28
Svp pouvez vous m'aider ​
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