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July 2022
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помогите кто может под буквой А и Б
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m11m
А) А₁=13 А₂₀=11,5
S₂₀=
(A₁+A₂₀)*20
=10*(13+11.5)=10*24.5=245
2
Ответ: 245
б) А₂+А₁₉, А₁₉=-23
А₂=А₁+d
A₁=A₂-d
A₂₀=A₁₉+d
S₂₀=
(A₁+A₂₀)*20
=10*(A₂-d+A₁₉+d)=10*(A₂+A₁₉)=10*(A₂-23)=10A₂-230
2
Ответ: 10А₂-230.
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Answers & Comments
S₂₀=(A₁+A₂₀)*20 =10*(13+11.5)=10*24.5=245
2
Ответ: 245
б) А₂+А₁₉, А₁₉=-23
А₂=А₁+d
A₁=A₂-d
A₂₀=A₁₉+d
S₂₀=(A₁+A₂₀)*20=10*(A₂-d+A₁₉+d)=10*(A₂+A₁₉)=10*(A₂-23)=10A₂-230
2
Ответ: 10А₂-230.