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=
(Делим как вам удобно)
x=0.4 (Получаем ответ)
Если все понятно не забудь поставить лучший ответ
Пошаговое объяснение:
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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
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