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1990la put1990-1989ori1990la put 1989 (1990+1990la put2):(1990la put0+1990la put1

Răspuns :

1990¹⁹⁹⁰-1989 ×1990¹⁹⁸⁹=
=1990¹⁹⁸⁹(1990-1989)=
=1990¹⁹⁸⁹


(1990+1990²):(1990⁰+1990¹)=
=1990(1+1990):(1+1990)=
=1990


=1990