Given that ABC three points are on the same straight line, ab = 100 cm, BC = 3 / 8 AB, e is the midpoint of AC, find the length of be?

Given that ABC three points are on the same straight line, ab = 100 cm, BC = 3 / 8 AB, e is the midpoint of AC, find the length of be?

When C is in the middle of AB, AC = 5 / 8ab = 62.5 ﹣ AE = 31.25 ﹣ be = ab-ae = 100-31.5 = 68.75; when C is outside AB, if C is on the left side of a, then BC > AB, not in line with the title; if C is on the right side of B, then AC = AB + BC = 11 / 8ab = 137.5 ﹣ AE = 68.75 ﹣ be = ab-ae = 31.25