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2 Efectuează:
147+236=.......
489+408=...
836+ 47=...
456+536=.......
884+ 9=.......
158+748=.......
574+238=.......
325+487=.......
518+353=.......
265+685=......
339+347=.......
177+268=.......
469+389=.......
583+218=.......
616+ 84=.......
269+725=.......
268+316+407=.....
229+445+196=.......
358+134+218=......
627+246+119=......
135+209+387=.....
407+ 98+137=.....​