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arseniy0114
arseniy0114
27.07.2022 17:19 •  Математика

Среднее арифмитическое трех чисел равно 1.64, причем второе число составляет 1.2 от первого, а третье на 10% меньше второго. найдите эти числа

👇
Ответ:
Polhova1606
Polhova1606
27.07.2022

Пошаговое объяснение:

первое х

второе 1,2х

100%-10%90%= что составляет 90/100=0.9  

третье 1,2х*0,9=1,08х

(х+1,2х+1.08х)/3=1,64

3,28x=1,64*3

x=1,64*3/3,28=1,5 первое число

1.2*1.5=1.8 второе число

1.8*0.9=1,62 третье число

проверка

(1,5+1.8+1.62).3=4,92.3=1,64

4,4(59 оценок)
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Ответ:
tseng7788
tseng7788
27.07.2022

Пошаговое объяснение:

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4,6(44 оценок)
Ответ:
kakaxa6
kakaxa6
27.07.2022

Об'єм зміниться у 27 разів.

Формула для знаходження об'єму така: V=abc, де V- об'єм, a, b, c - ребра прямокутного паралелепіпеда .

Якщо кожне ребро збільшити в три рази, то V₂=3a*3b*3c=3³abc=27abc

\frac{V_{2}}{V} = \frac{27abc}{abc} =27

V

V

2

=

abc

27abc

=27

Отже об'єм другого прямокутного паралелепіпеда більший від об'єму першого прямокутного паралелепіпеда в 27 разів.

Взагалі якщо всі ребра прямокутного паралелепіпеда збільшити на будь яке число,то об'єм збільшиться на це число в кубі (тричі перемножене саме на себе)

4,5(36 оценок)
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