Salut aidez-moi svp c'est urgent ; Propagation couper court suivant ::: A= (2x + 3) ² ; B= (7x₋3y)² ; C= (2x + y )³ ; D= (x+y)²₋(x₋y)² ; E= (a + b - c)³ ; F= (a₊b)³₋(a₋b)³
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= 2x²+2*2X*3+3
= 2x²+12X +9 (*) : signifie fois
B=(7X-3y)²
= 7X²-2*7X*3y+3y²
= 7X² - 42Xy+9y
C= (2X+y)³
= 2X³+3*2X²y+3*2X*y²+y³
= 2X³+6X²y+6Xy²+y³