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Sagot :

bonjour

(3+x)²=9+6x+x²

(3x+4)²=9x²+24x+16

(5-x)(5+x)

=25+5x-5x-x²

=-x²+25

(5x-3)(5x+3)

=25x²+15x-15x-9

=25x²-9

(x-3)²=x²-6x+9

(7x-1)²

=49x²-14x+1

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