Contact us
Choose a category below so we can get back to you as quickly as possible.
0.2:0.4=0.5,0.5:1=0.5組成比例是:0.2:0.4=0.5:1;故答案為:0.2:0.4=0.5:1(答案不唯一).
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.