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В арифметической прогрессии первый член равен -3 а сумма первых шести членов равна 12. Найдите третий член прогрессии. прошу с полным решением (Я эту тему в школе пропустила,а теперь не могу понять)
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помогите пожаааалуйста, очееень надоооооооооооо
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The
end of big computers
B.
Starting a business
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