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
Поделитесь своими знаниями, ответьте на вопрос:
Велосипедист и мотоциклист выехали одновременно из двух поселков навстречу друг другу. велосипедист -- со скоростью 15 км/ч, а мотоциклист -- со скоростью 57 км/ч расстояние между поселками 288 км. какое расстояние будет между ними через 3 ч после начала движения?
Условия задачи:
S=288 км
v₁=15 км/ч
v₂=57 км/ч
t=3 ч
Найти:
S =? км, если t=3 ч
Решение
1) 15+57=72 (км/ч) - скорость сближения велосипедиста и мотоциклиста
2) S(расстояние)=v(скорость)×t(время)
S=72×3=216 (км) - расстояние, которое за 3 часа проедут велосипедист и мотоциклист.
3) S=288-216=72 (км) - расстояние, которое будет между велосипедистом и мотоциклистом через 3 часа.
ответ: 72 км