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Sagot :

Bonjour,

H= (2 -x) (2-x)

= 4 -2x -2x +x²

= x² -4x +4

I= (a+b) ( a-b)

=  a² -ab -ab =b²

= a² -b²

J= (x+6)²

= x² +6x+ 6x +36

= x² +12x +36

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