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Daca x+z=12 si x=5. calculati xy+xz-59=


Răspuns :

daca x=5 inlocuim in x+z=12
5+z=12
z=12-5
z=7
xy+xz-59=5y+5·7-59=5y+35-59=5y-24
5y-24=0
5y=24
y=24/5
y=4,8