Contact us
Choose a category below so we can get back to you as quickly as possible.
錯誤. 因為一個數沒有確定,沒有說0除外,如果一個數是0,那麼0乘以9還是0,就沒有擴大9倍,所以是錯誤的
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.