Contact us
Choose a category below so we can get back to you as quickly as possible.
因為|a-56|+|72-b|+|c-63|=0 所以|a-56|=0,|72-b|=0,|c-63|=0 所以a=56,b=72,c=63 -a=-56,-b=-72,-c=-63 因為-56>-63>-72 所以-a>-c>-b
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.