Contact us
Choose a category below so we can get back to you as quickly as possible.
可以把被減數看成是1,差就是3/5,減數就,2/5 280÷(1+3/5+2/5)=140 被減數=140×1=140 減數=140×2/5=56 差=140×3/5=84
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.