Contact us
Choose a category below so we can get back to you as quickly as possible.
a-6的絕對值+(3b+6)²=0 所以a-6=0,3b+6=0 a=6,b=-2 所以a+b=6-2=4
平均數和方差一般能反映
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.