Contact us
Choose a category below so we can get back to you as quickly as possible.
設爺爺的年齡是x歲,那麼((x+12)÷4-15)×10=100 解得x=88歲 答:這位老爺爺現在88歲. 如果沒有學過方程可以反著算: 不乘以10,是10,不减去15則是25,再乘以4是100100减去12就等於88歲.
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.