efectueaza utilizand factorul comun 1999×2000-1998×1999-2×1998​ repede dau coroana

Răspuns :

Salutare!!

[tex] \bf 1999 \cdot 2000-1998 \cdot 1999-2 \cdot1998 = [/tex]

[tex] \bf 1999 \cdot (2000-1998) -2 \cdot1998 = [/tex]

[tex]\bf 1999 \cdot 2 -2 \cdot1998 = [/tex]

[tex]\bf 2 \cdot (1999 - 1998)= [/tex]

[tex]\bf 2 \cdot 1 = [/tex]

[tex] \boxed{\bf 2 }[/tex]

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