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va rog frumos mult mult

Va Rog Frumos Mult Mult class=

Răspuns :

a) 17x99=17x(100-1)=17x100-17x1=1700-1=1683
b) 345x101=345x(100+1)=345x100+345x1=34500+345=34845
c) 57x11=57x(10+1)=57x10+57x1=570+57=627
d) 97x999=97x(1000-1)=97x1000-97x1=97000-97=96903