Contact us
Choose a category below so we can get back to you as quickly as possible.
原式=a²;x²;+2abxy+b²;y²;+a²;y²;-2abxy+b²;x²;=(a²;x²;+a²;y²;)+(b²;x²;+b²;y²;)=a²;(x²;+y²;)+b²;(x²;+y²;)=(x²;+…
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.