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Dariya002324
@Dariya002324
August 2022
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sedinalana
Verified answer
A1=2
a2=4
d=a2-a1=2
an=a1+d(n-1)=2+2(n-1)=2+2n-2=2n
x=2n
Sn=(a1+an)*n/2
Sn=(2+2n)*n/2=930
2n²+2n=1860
n²+n-930=0
D=1+3720=3721
n1=(-1-61)/2=-31 не удов усл
n2=(-1+61)/2=30
x=2*30
x=60
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Answers & Comments
Verified answer
A1=2a2=4
d=a2-a1=2
an=a1+d(n-1)=2+2(n-1)=2+2n-2=2n
x=2n
Sn=(a1+an)*n/2
Sn=(2+2n)*n/2=930
2n²+2n=1860
n²+n-930=0
D=1+3720=3721
n1=(-1-61)/2=-31 не удов усл
n2=(-1+61)/2=30
x=2*30
x=60