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Efectuati:
a) x(x-4+x)=
b) 2x( x-3)=
c) (x-1)(2x+5)=
d) (x-2)(x+3)=
Dau coroniță!


Răspuns :

a)=x(2x-4)=x*2x+x*-4=2x^2-4x b) =2x*x+2x*-3=2x^2-6x=2*x*(x-3) c)=x*2x+x*5+-1*2x+-1*5=2x^2+5x-2x-5=2x^2+3x-5 d) =x*x+x*3+-2*x+-2*3=x^2+3x-2x-6=x^2+x-6