Contact us
Choose a category below so we can get back to you as quickly as possible.
∵x1,x2,x3的平均數為.x,∴x1+x2+x3=3.x,∴3x1+5,3x2+5,3x3+5的平均數為13(3x1+5+3x2+5+3x3+5)=13[3(x1+x2+x3)+15]=3.x+5.故答案為3.x+5.
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.