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Rezolvati in Z ecuatiile:
(x+2)(x-3)=0;
(2x-4)(4x+12)=0;
(3x+27)(-x+6)=0;
(x-1)(3x+15)(5x-5)=0


Răspuns :

primul exercitiu , restul le trimit imediat
Vezi imaginea PETRESCUALINA
1...  x+2=0 => x=-2 si x-3=0 => x=3 ;
2...  2x-4=0 => 2x=4   x=2  ; 4x+12=0 => 4x=-12  x=-3 ;
3... 3x+27=0 => x=-27:3=-9 ; -x+6=0 =>  -x=-6  x=6 ;
4... x-1=0 => x=1  ;  3x+15=0 => x= -15:3 = -5 ;  5x-5=0 => x=1 ;