[tex]1 \times 4 + 2 \times 7 + 3 \times 10 + ...+ 9 \times 28[/tex]помогите решить. Created by Luckyboy4. matematika-ru

tex]помогите решить...

Luckyboy4 @Luckyboy4

July 2022 1 1 Report

[tex]1 \times 4 + 2 \times 7 + 3 \times 10 + ...+ 9 \times 28[/tex]
помогите решить

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Mihail001192

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$1 \times 4 + 2 \times 7 + 3 \times 10 + 4 \times 13 + 5 \times 16 + 6 \times 19 + 7 \times 22 + \\ \\ + 8 \times 25 + 9 \times 28 = 4 + 14 + 30 + 52 + 80 + 114 + 154 + 200 + 252 = 900 \\ \\$

ОТВЕТ: 900

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Luckyboy4 August 2022 | 0 Ответы

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