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Sagot :

INEQUATION

Bonjour,

Développer:

(2x+5)(2x-5)= 4x²+10x-10x-25= 4x²-25

205²-190²= (200+5)²-(190+5)²= (200+5+190+5)(200+5-190-5)

                = (400)(10)= 4 000

FANTINE76
a) 2x*2x-2x*5-5*2x-5*5
=4x(au carré)-10x-10x-25
=4x(au carré)-25
b) (205-195)*(205+195)
=10*400
=4000

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