Contact us
Choose a category below so we can get back to you as quickly as possible.
兩邊同除以6 =0.6:7分之1 兩邊同乘以7 =4.2:1 兩邊同乘以5 =21:5 比值=21÷5=4.2
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.