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Răspuns :

a) (257+23)•(413-63)=

=280•350=

=98000

b) (2+4+6+8+10+12)•(1+3+5+7+9)=

=(6+6+8+10+12)•(4+5+7+9)=

=(12+8+10+12)•(9+7+9)=

=(20+10+12)•(16+9)=

=(30+12)•25=

=42•25=

=1050