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Sagot :

Bonjour

(a-b) (a+b) = a² -b²

a)

identité remarquable

(x+1-2) (x+2 +2) =

(x-1) ( (x+4)

b)

identité remarquable

(3-2x+1) (3 +2x-1) =

4-2x) ( 2+2x)

c)

identité remarquable

(x+1 -x +1) ( x+1 +x-1)=

2 ( 2x )

d)

(y+3) (x-1 -2)=

( y+3) ( x-3)

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