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July 2022
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найдите сумму первых 15 членов арифметической прогрессии а20=0;а66=-92
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asanali98
A20=0; a66=-92
an=a1+(n-1)d
Sn=(a1+an)/2*n
a20=a1+19d=0
a66=a1+65d=-92
46d=-92
d=-92/46=-2
a1=0-92*(-2)=38
a15=38+14*(-2)=38-28=10
S15=(38+10)/2*15=360
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Answers & Comments
an=a1+(n-1)d
Sn=(a1+an)/2*n
a20=a1+19d=0
a66=a1+65d=-92
46d=-92
d=-92/46=-2
a1=0-92*(-2)=38
a15=38+14*(-2)=38-28=10
S15=(38+10)/2*15=360