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Madison666
@Madison666
July 2022
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Умоляю помогите с задачами!!!
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Seanel
Перепроверь с вычислениями, я могла, сонная, ошибок мелких наделать:)
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dariaanisimova99
2) x1=2-1^2=1
x2=2-2^2= -2
x3=2-3^2= -7
x4=2-4^2=-14
3) 32;28;..
d=28-32= -4
a13=a1+(13-1)*d
a13=32+12*(-4)= -16
4) a1=5+2=7
a20=5*20+2=102
S20=(a1+a20/2)n=(7+102/2)20=1090
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Answers & Comments
x2=2-2^2= -2
x3=2-3^2= -7
x4=2-4^2=-14
3) 32;28;..
d=28-32= -4
a13=a1+(13-1)*d
a13=32+12*(-4)= -16
4) a1=5+2=7
a20=5*20+2=102
S20=(a1+a20/2)n=(7+102/2)20=1090