XXXV = 35
XXXV = L - XV → 35 = 50 - 15 → am mutat doua chibrituri: pe 5 (V ) de la 55 ( LV) l-am mutat la 10 ( X )
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a) III + I = V - I → 3 + 1 = 5 - 1 = 4
b) XX = X + X
c) XXVI - IV = XI + XI → 26 - 4 = 11 + 11 = 22
