Question

同一直线上有a、b、c、d四点,已知db=0.6ad,ac=2.5cb,cd=4,求ab的长度

Answer 1

设bc=x.bd=4+x=0.6ab=0.6（4+2.5x）.

4+x=2.4+1.5x

x=3.2

ab=2.5x-x=1.5x=1.5×3.2＝4.8.