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Sagot :

E= (2/3x)^2 + 2X2/3x X 1/2+ (1/2)^2
= 4/9^2 + 2/3x + 1/4

F= (4/3x)^2 - 2X4/3x X 2/3 +(2/3)^2
= 16/9x^2-16/9x+4/9
CHAYMAE85

Explications étape par étape:

E=(2/3x+1/2)^2

=(2/3x)^2 +2×(2/3x)×1/2+(1/2)^2

=4/9x^2+2/3x+1/4

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