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Sagot :

(-5y+1)²-(2y-3)²

=-5y*2y+1²*2y+-5y*3²+1²*3²

=10y+2y²+15y²+3²

=10y +(2+15+3)y²

=10y+20y²

 

 

 

C'est sa je pense!!

 

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