Предмет: Математика, автор: kiril6027

как найти площадь развёртки куба если известен объём 3 целых три восьмых

Ответы

Автор ответа: CVita
0
из объема куба можно вычислить сторону куба, если только вспомнить формулу объема
V=a^3 \ a= sqrt[3]{V}  \ a= sqrt[3]{3 frac{3}{8} }= sqrt[3]{ frac{27}{8} }=3/2
площадь поверхности куба ищем по формуле
S=6*a^2 \ S=6*( frac{3}{2})^2=6* frac{9}{4}= frac{54}{4}=13 frac{1}{2}
Автор ответа: assol79
0
V=a³
S=6а²
а=∛3  3/8=1,5 см  сторона куба
S=6*1,5²=13,5 см² площадь развёртки куба


Похожие вопросы
Предмет: Английский язык, автор: nfjkfnk
10.1. Раскройте скобки в предложениях, поставив глагол в правильную грамматическую форму:
1. I _____________(speak) to her several times, but she always ________________
(read) and _____________________(not hear) me.
2. He ___________________(lose) his watch while he ____________________(see)
the sights of the city.
3. He ________________(teach) English for two months when he ______________
(live) in Germany and _____________________(work) as a journalist.
4. I _______________(open) the door just as Tom _______________(ring) the bell.
5. The house _____________________(burn) fast, so we _____________________
(break) a window to get out.
6. Maisie ____________(cook) fish when I first ___________(ask) her to marry me.
7. We ________________(walk) to the station when it ____________(begin) to rain.
8. We _____________(run) under a bridge when the storm ______________(break).
9. My sister __________________(drop) two cups while she __________________
(wash up) last night; neither of them _____________________(break).
10. She ______________(put) on her raincoat when it _____________(start) to rain.
11. When the teacher ______________(come) in, the boys _______________(play).
12. The ship _________________(sink), so all the passengers __________________
(jump) into the boats.
13. He _____________________(think) of something else all the time you
_____________________ (talk) to him.
14. He ____________(eat) three sandwiches while you _____________(talk) to him.
15. When I ____________________(see) him, he ___________________(sing) and
_____________________(smoke) a cigar at the same time.
16. Maisie __________________(peel) potatoes when Tom ___________________
(ask) her to marry him.
17. The dog ____________(bite) her on the ankle while she ____________(catch) it.
18. While he __________________(get) off the bus, he ___________________(fall)
and _____________________(cut) his face.
19. He ___________________(lean) against the door and _____________________
(listen) to the radio when I first _____________________ (try) to speak to him.
20. While he _________________(write) a letter the telephone _________________
(ring); as he _________________(go) to answer it, he ___________________(hear)
a knock at the door; the telephone still _____________________ (ring) while he
__________________(walk) to the door; but just as he ________________(open) it,
it _____________________ (stop).
Предмет: Математика, автор: fatima1994