A___B___C___D
AB/BC =x
BC/CD =y
AB/BC *BC/CD =AB/CD =xy
AC/CD =(AB+BC)/CD =AB/CD +BC/CD =xy +y =(x+1)y
1) x=4/3, y=5/7
(x+1)y =7/3 *5/7 =5/3
2) x=3/4, y=5/7
(x+1)y =7/4 *5/7 =5/4
3) x=4/3, y=7/5
(x+1)y =7/3 *7/5 =49/15
4) x=3/4, y=7/5
(x+1)y =7/4 *7/5 =49/20
A___B___C___D
AB/BC =x
BC/CD =y
AB/BC *BC/CD =AB/CD =xy
AC/CD =(AB+BC)/CD =AB/CD +BC/CD =xy +y =(x+1)y
1) x=4/3, y=5/7
(x+1)y =7/3 *5/7 =5/3
2) x=3/4, y=5/7
(x+1)y =7/4 *5/7 =5/4
3) x=4/3, y=7/5
(x+1)y =7/3 *7/5 =49/15
4) x=3/4, y=7/5
(x+1)y =7/4 *7/5 =49/20