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Sagot :
(1)
=(x+4)(x+5)
=x(x+5)+4(x+5)
=x^+5x+4x+20
=x^+9x+20
(2)
=(x+4)(x-5)
=x(x-5)+4(x-5)
=x^-5x+4x-20
=x^-x-20
(3)
=(x-4)(x+5)
=x(x+5)-4(x+5)
=x^+5x-4x+20
=x^+x+20
(4)
=(x-4)(x-5)
=x(x-5)-4(x-5)
=x^5x-4x+20
=x^-x+20
(5)
=(x+7y)(x+7y)
=x(x+7y)+7y(x+7y)
=x^+7xy+7xy+49y^
=x^+14xy+49y^
It was very easy
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