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polinagrimes
@polinagrimes
July 2022
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ПОМОГИТЕ С РЕШЕНИЯМИ, ПОЖАЛУЙСТА!!!!!!
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Keelat
1) an = -31+ 8n
a1 = -31 + 8 = -23
a18 = -31 + 144 = 113
S 18= 0.5 * (-23 + 113) * 18 = 810
Ответ: 810
2) (28a - 7*(4a-b)) \ (16a^2 - b^2)
(28a - 28a + 7b) \ (16a^2 - b^2)
7b \ (16a^2 - b^2)
Подставляем:
42 \ (64 - 36) = 1.5
Ответ: 1.5
3) -6 - 6x - 3x <= 2
9x >= -8
x >= -8\9
Ответ: 3
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Answers & Comments
a1 = -31 + 8 = -23
a18 = -31 + 144 = 113
S 18= 0.5 * (-23 + 113) * 18 = 810
Ответ: 810
2) (28a - 7*(4a-b)) \ (16a^2 - b^2)
(28a - 28a + 7b) \ (16a^2 - b^2)
7b \ (16a^2 - b^2)
Подставляем:
42 \ (64 - 36) = 1.5
Ответ: 1.5
3) -6 - 6x - 3x <= 2
9x >= -8
x >= -8\9
Ответ: 3