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1.Daca a+b= -40, c= -35, calculati axb+bxc.

2,Daca a+b=85 , c= -12 , calculati axc+bxc.

3.Daca a-b= -82, c= -35, calculati axc+bxc.


Răspuns :

1) a×c+b×c= c×(a+b)= -35×(-40)=1400 2) a×c+b×c= c×(a+b)= -12×85= -1020 3)a×c-b×c= c×(a-b)= -35×(-82)=2870