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2014-01-16T20:49:34+01:00
Bonsoir
A= 8t-8 = 8(t -1)

B= 28a² + 42a = 14a(2a + 3)

C= 120x² + 48x = 24x ( 5x + 2)

D= 8-4t ²  = 4 (2 - t²)

 A=8x - 12x + 20x
= 28x -12x = 16x