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Daca x*y=77 si x*z=25,calculati x*(y+z) si x*(y-z)

Răspuns :

x*y=77
x*z=25
x(y+z)=
=x*y+x*z=
=77+25=102

x(y-z)=
=x*y-x*z=
=77-25=52
x•(y+z)=x•y+x•z=77+25=102; x•(y-z)=x•y-x•z=77-25=52

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