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(2000-100x1)x(2000-100x2)x...x(2000-100x20)

Răspuns :

a) 
(2000-100x20)=2000-2000=00
b)
(2010-201x10) =2010-2010=0

(2000-100x1)x(2000-100x2)x...x(2000-100x20) =

=1900*1800*....*0= 0