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la o libraries-au aduus 5 cutii cu cate 246 de masinute si tot atatea cutii cu cate 386 de papusi.Cate jucarii s-au adus? (Rezolva in doua moduri)

Răspuns :

246×5+386×5


5×(246+386)

varianata I

5x246=1230 masinute

5x386=1930 masinute

1230+1930=3160 masinute in total

varianta II

(5x246)+(5x386)=

=1230+1930=

=3160 masinute

varianta III

5x(246+386)=

=5x632=

=3160 masinute