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1nasttyaaa1
@1nasttyaaa1
June 2022
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Решите пожалуйста умоляю как можно быстрее и понятнее
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mikael2
Verified answer
1. bn=b1+d(n-1) b8=-1.2+3*7=19.8 b21=-1.2+3*21=61.8
2. a1=-0.3 a7=1.9
-0.3+d*6=1.9
6d=1.9+0.3=2.2 d=0.3(6)
3. an=9+3*(n-1) =3n+6=12 3n=6 n=2
1) sn=[(2a1+d(n-1)]*n/2
s20=[2*16.5-1.5*19]*20/2=[33 -28.5]*10=44.5
2) s7=[2s1+d*6]*7/2=[2*16+3*6]*3.5 =50*3.5=175 м
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Answers & Comments
Verified answer
1. bn=b1+d(n-1) b8=-1.2+3*7=19.8 b21=-1.2+3*21=61.82. a1=-0.3 a7=1.9 -0.3+d*6=1.9 6d=1.9+0.3=2.2 d=0.3(6)
3. an=9+3*(n-1) =3n+6=12 3n=6 n=2
1) sn=[(2a1+d(n-1)]*n/2
s20=[2*16.5-1.5*19]*20/2=[33 -28.5]*10=44.5
2) s7=[2s1+d*6]*7/2=[2*16+3*6]*3.5 =50*3.5=175 м