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Дана арифметическая прогрессия 3;-2;-7.....
Найдите S8; d-? Пожалуйста-
Предмет:
Алгебра -
Автор:
cookie doughvzet - 5 лет назад
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Ответы 1
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d=-5
a8=3+7*(-5)=-32
S8=((3+(-32)/2)*8=116
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Автор:
guillermo53 - 5 лет назад
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0
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Choose the right variant.
1. His advice … always reasonable. I advise you to follow….
a) are, them
b) are, it
c) is, it
d) is, them
2.The applause … deafening. I can't stand … any longer. Let's go out.
a) are, them
b) is, it
c) is, them
d) are, it
3.The second witness's evidence … more convincing. … made me believe that the suspect is innocent.
a) are, it
b) is, it
c) are, they
d) is, they
4.Look, her clothes … brand new. Where did she get the money to buy …?
a) is, it
b) are, it
c) are, them
d) is, them
5.The Browns who lived in … house … dining with the Harrisons who … their best friends.
a) a three-storey, were, were
b) three-storeys, were, was
c) a three-storey's, were, were
d) three-storeys', was, were
6.The information he gave us … convincing. I don't think we should check ….
a) is, it
b) is, them
c) are, them
d) are, it
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a) is, it
b) is, them
c) are, it
d) are, them
8.These scissors … dull! I can't cut anything with ….
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b) is, them
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b) they, them
c) they, it
d) it, them
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d) has been, is, it
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b) is, two-day's
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a) works, them
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c) works, it
d) work, them
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Предмет:
Английский язык -
Автор:
allison - 5 лет назад
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Ответов:
1 -
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1.Угол при основании равнобедренного треугольника равен 55°. Найдите угол при вершине этого треугольника.
А)70°
Б)55°
В)60°
Г)110°
2.Какому значению среди перечисленных может равняться длина стороны AC треугольника ABC, если AB=3 см, BC=10 см?
А)15 см
Б)11 см
В)7 см
Г)5 см
3.На боковых сторонах АВ и ВС равнобедренного треугольника АВС обозначили соответственно точки E и F так, что АС = AF = EF = BE. Найдите угол АВС
4.В треугольнике АВС известно, что ∠ А = α, биссектрисы внешних углов при вершинах В и С пересекаются в точке О. Найдите угол ВОС.
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