Contact us
Choose a category below so we can get back to you as quickly as possible.
因為(a-b)^2>=0即a^2+b^2-2ab>=0所以移項得a^2+b^2>=2ab(-m-n)^2=(m+n)^2
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.