Răspunsuri

2014-09-22T19:31:58+03:00
--- --- ---|--- --- -|- --- -|- --- -|- --- --- --- --- --- --- ---
                    A     M      B
           0 1 2  3  4  5  6   7

M =( B-A) : 2 = (7-3) :2=4:2=2
 
20 4 20