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(4x-5y)(2x 3y)= ???
Am nevoie urgent, va rog...


Răspuns :

[tex](4x-5y)(2x+3y)=2x(4x-5y)+3y(4x-5y)=2x4x-2x5y+ \\ +3y4x-3y5y=8x^2-10xy+12xy-15y^2.[/tex]