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Sagot :

(7x+4)²+(9x-3)²
=49x²+56x+16+81x²-54x+9
=130x²+2x+25

9x(x-9)-(7x+2)²
=9x²-81-(7x+2)(7x+2)
=(3x+9)(3x-9)-(7x+2)(7x+2)

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