Contact us
Choose a category below so we can get back to you as quickly as possible.
令2n-m=3k,k為整數 則:m=2n-3k 所以:8n^2+10mn-7m^2 =8n^2+10(2n-3k)n-7(2n-3k)^2 =54kn-9k^2 =9*(6kn-k^2) 其中k,n為整數 所以:8n^2+10mn-7m^2是9的倍數
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.