Contact us
Choose a category below so we can get back to you as quickly as possible.
其中一個外項:(37+13)/2=25 另一個外項:27-25=12 前面的一個內項:25/(5/6)=30 後面的內項:(5/6)*12=10 比例式:25:30=10:12=5/6 不滿意可以關閉問題,無所謂~
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.