Răspuns:
[tex]a + b = 15\\\\a = b - 3 = > b = a + 3\\\\a + a + 3 = 15\\\\2a = 15- 3\\\\2a = 12 = > a=12:2= > a=6\\\\b = a + 3 = 6 + 3 = > b= 9\\\\\\a. /.../\\\\b. /.../..+3../ \\-------\\15-suma\\\\1 + 1 = 2 -segm. egale\\ \\15 - 3 = 12 \\\\12 : 2 = 6 -(a) \\\\6 + 3 = 9-(b)[/tex]