Contact us
Choose a category below so we can get back to you as quickly as possible.
∵m2-mn=20 ①,mn-n2=-8 ②,∴①+② 득:m2-n2=12,즉 m2-n2+2=14;①-② 득:m2-2mn+n2=28.
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.