an+1=an+d1)an17=a16+d=47+9=562)a19=a20-d=-21+3=-183)d=a12-a11=-29+33=4an=a1+d(n−1)4)a1=an-d(n-1)= -11-5*6 =-41a15 = -41+5*14 =295)a1=a19-d*18=-31+8*18=113a8=a1+d(n-1)= 113-7*8 = 576)a7=a1+6d
a22=a1+21d
a22-a7=a1-a1+15d
15d=45
d=3
7)
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
an+1=an+d
1)an17=a16+d=47+9=56
2)a19=a20-d=-21+3=-18
3)d=a12-a11=-29+33=4
an=a1+d(n−1)
4)a1=an-d(n-1)= -11-5*6 =-41
a15 = -41+5*14 =29
5)a1=a19-d*18=-31+8*18=113
a8=a1+d(n-1)= 113-7*8 = 57
6)a7=a1+6d
a22=a1+21d
a22-a7=a1-a1+15d
15d=45
d=3
7)
an =(an + 1 + an - 1)/2a15=(14-22)/2=-4
8)2*a10=a11+a9
a9=2*a10-a11=-70+59 =-11
9) 2*a23-a24+a22
a24=2*a23-a22=2*33+3=69