Răspuns:
Explicație pas cu pas:
4b------------3r-------------17 m x -2
3b-------------2r-------------12 m x 3
--------------------------------------------------
-8b---------- -6 r---------- - 34 m
9b---------------6r---------------36
--------------------------------------------------------------
b-------------------\-----------------2 m
b=2 m
3b=2x3=6--------------12 m
2 r=12-6 2r=6 r=6/2=3 m