所示的数轴中,点a.b.c对应的数分别为a.b.c,oa＝ob=bc=n,化简/a-b/-/b-c/+/a+b+c/.根据数轴 a-b > 0 b-c > 0 a+b+c < 0 /a-b/-/b-c/+/a+b+c/.= a-b -b+c - a-b-c= -3b oa＝ob=bc=n 所以 b = -n原式 = -3 x (-n) = 3n...