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Sagot :

x²-(x-1)(x+1)=
x²-(x²+x-x-1)    (x foi x+xfoi1-1foix-1foi1)
x²-(x²+x-x-1)
x²-x²+1
x=1
x² - ( x-1 ) ( x+1 )= x²-(x²-1)=x²-x²+1=1

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