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Daca x*y=30 si x*z=25,calculati x*(y+z) si x*(y-z).

Răspuns :

x*y=30
x*z=25

x*(y+z)=
=x*y+x*z=
=30+25=55

x*(y-z)=
=x*y-x*z=
=30-25=5