Răspuns :
1n____ ____
2n____
3n____ ____ ____
3-1=2segm figureaza18
18:2=9 -2nr
9x3=27 -3nr
9x2=18-1nr
proba27-9=18
2n____
3n____ ____ ____
3-1=2segm figureaza18
18:2=9 -2nr
9x3=27 -3nr
9x2=18-1nr
proba27-9=18