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Sagot :

AYUDA

bjr

Q 3

A = 2 (4x + 8) = 2 * 4x + 2 * 8 = 8x + 16

et

B = (4+x)² - x² = 4² + 2*4*x + x² - x = 16 + 8x + x ² - x = 8x + 16

comme k(a+b) = ka + kb

et que (a+b)² = a² + 2ab + b²

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