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Daca xy+xz=125 si x=5 ,calculati y+z

Răspuns :

xy+xz=x(y+z)=125
5·(y+z)=125 =>y+z=25
xy+xz=125   si  x=5
y+z= ?
xy+xz=x(y+z)=5(y+z)=125 ⇒y+z=125:5 ⇒y+z=25
R: y+z=25