petrosyan35
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(3, 1x+x): 0, 8=2, 05 решить это уравнение, я пытаюсь, но не могу правильно решить : (​

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х=0,4

Пошаговое объяснение:

(3.1х+х):0,8=2,05

4,1х=2,05×0,8

4,1х=1,64

х=0,4

npdialog66

ответ: x=0.4

Пошаговое объяснение: В скобках объяснение

(3.1x+x):0.8=2.05     (Складываем x и переносим известные в одну сторону а неизвестные в другую)

4.1x=2.05*0.8  (Умножаем, лучше всего столбиком чтобы не ошибиться)

4.1x=1.64 (Нужно оставить в левой части один лишь x для этого надо разделить обе части на 4,1)

x=\frac{1.64}{4.1}  (Делим как вам удобно)

x=0.4 (Получаем ответ)

Если все понятно не забудь поставить лучший ответ

rsd737

Пошаговое объяснение:

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Roman343247

Пошаговое объяснение:

9)

(30088-27028):30+29*31=1001

1)

_30088

27028

3060

2)

_3060 |__30

30 |102

_60

60

0

3)

29*31=20*31+9*31=620+279=899

4)

102+899=1001

10) магазины

1 магазин

1)4*190=760(руб) стоят 4 полотенца

2)760+950=1710 (руб) стоят полотенца и противень

3)5*90=450 (руб) стоят 5 стаканов

4)1710+450=2160 (руб) стоят 5 стаканов 4 полотенца и противень

5)2160+500=2660 (руб) вся покупка первого магазина

2магазин

1)220*4=880 (руб) стоят 4 полотенца

2)880+940=1820 (руб) стоят 4 полотенца и противень

3)5*80=400 (руб) стоят 5 стаканов

4)400+1820=2220(руб) стоят 4 полотенца, противень, 5 стаканов

5)2220+470=2690(руб) вся покупка второго магазина

ответ: 2660 рублей покупка первого магазина. Дешевле.

11) города

Согласно графику, город Пекин 4 по численности населения

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