Contact us
Choose a category below so we can get back to you as quickly as possible.
設再過x年後奶奶的年齡是孫子的4倍,由題意得(13+x)×4=64+x ; ; ; ; ;52+4x=64+x ; ; ; ; ; ; ; ;3x=12 ; ; ; ; ; ; ; …
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.