Contact us
Choose a category below so we can get back to you as quickly as possible.
已知a,b互為相反數,c,d互為倒數,X的絕對值是1, a+b=0 cd=1 x=±1 x2-(a+b+cd)x-cd =1-(0+1)×(±1)-1 =±1
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.