Contact us
Choose a category below so we can get back to you as quickly as possible.
a=(5/9)b a:b=5:9=10:18 b=(2/3)c b:c=2:3=18:27 所以,a:b:c=10:18:27 a:c=10:27 a是(b+c)的2/9
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.