Những câu hỏi liên quan
Nguyễn Ngọc Khánh	Vy
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Edogawa Conan
28 tháng 4 2020 lúc 16:02

a) Thể tích của hình hộp chữ nhật là:

  8 x 7 x 9 = 504 (cm3)

b) Cạnh của hình lập phương là:

  (8 + 7 + 9) : 3 = 8 (cm)

Thể tích hình lập phương là:

  8 x 8 x 8 = 512 (cm3)

Khách vãng lai đã xóa
Nguyễn Mạnh Dũng
28 tháng 4 2020 lúc 16:31

a , thể tích hình hộp chữ nhật là :

8 x 7 x 9 = 504 (cm3)

b , thể tích hình lập phương là :

8 x 8 x 8 = 512 (cm3)

Đ/s : a,504 cm3

           b,512 cm3

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Nguyễn Tố Như
28 tháng 4 2020 lúc 17:58

1+1+1+1+1+1+1+1+1+1+1+1 1+1+1+1+1+1+1+1+1+1+1+1 1+1+1+1+1+1+1+1+1+1+1+1 1+1+1+1+1+1+1+1+1+1+1+1 1+1+1+1+1+1+1+1+1+1+1+1 1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1 1+1+1+1+1+1+1+1+1+1+1+1 1+1+1+1+1+1+1+1+1+1+1+1 = ............................................................................................................................................................................................................................

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Pham Trong Bach
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Cao Minh Tâm
27 tháng 11 2017 lúc 5:05

a, Thể tích hình hộp chữ nhật là:

8 x 7 x 9 = 504 (c m 3 )

b, Cạnh hình lập phương dài:

8 + 7 + 9 3 = 8 (cm)

Vậy thể tích hình lập phương là:

8 x 8 x 8 = 512 (c m 3 )

Đáp số: a, 504c m 3 và b, 512c m 3

Nguyễn Âu
28 tháng 3 2022 lúc 19:16

J

 

 

Lê Hồng Quân
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Trần Thanh Thiên
4 tháng 3 2023 lúc 21:03

Hình HỘP CHỮ NHẬT = Dài x Rộng x Cao

Hình Lập Phương = Cạnh x cạnh x cạnh

Vậy ta có phương trình sau:

a x a x a = 12 x 3 x a

a x a x a = 36 x a

a x a = 36

=> a = 6

Thể tích hình HHCN là: 12 x 3 x 6 = 216 (cm3)

Thể tích hình Lập Phương là: 6 x 6 x 6 = 216 (cm3)

Đ/s: 216 cm3 và 216cm3

nguyễn đình huy
20 tháng 3 lúc 7:39

dễ

 

nguyễn đình huy
20 tháng 3 lúc 7:40

mà sao bạn làm loằng ngoằng thế

 

nguyen tai nhat the
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Phạm Thảo Vy
20 tháng 3 2017 lúc 20:33

a ) Thể tích hình lập phương là :

        8  x  7  x  9  =  504  ( cm3 )

b ) Cạnh hình lập phương là :

       ( 8  +  7  +  9  )  :  3  =  8  ( cm )

    Thể tích hình lập phương là :

        8  x  8  x  8  =  512  ( cm)

            Đáp số  :  504 cm3  và  512 cm3

Tiến Minh Trương
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Đoàn Đức Hà
22 tháng 2 2022 lúc 14:21

Cạnh hình lập phương bằng chiều cao hình hộp chữ nhật nên diện tích đáy của hai hình bằng nhau.

Diện tích đáy hình hộp chữ nhật là: 

\(12\times3=36\left(cm^2\right)\)

Có \(36=6\times6\)nên cạnh hình lập phương hay chiều cao hình hộp chữ nhật là \(6\left(cm\right)\).

Thể tích hình lập phương hay thể tích hình hộp chữ nhật là: 

\(6\times6\times6=216\left(cm^3\right)\)

Khách vãng lai đã xóa
ThUyenn
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Hồ Nhật Phi
3 tháng 4 2022 lúc 10:18

Thể tích hình hộp chữ nhật là: 2x3x4=24 (cm3).

Thể tích hình lập phương là: 3x3x3=27 (cm3).

Tỉ lệ thể tích giữa hình hộp chữ nhật và hình lập phương là 24:27=8/9.

Vậy: A) Đ; B) S; C) Đ; D) S.

Đào Thiên Phước
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hồ Hải Triều
26 tháng 2 2017 lúc 8:59

đáp án đúng là 216 cm khối

Phạm Ngọc Diệp
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Trần Hà	Vy
2 tháng 3 2022 lúc 15:26

Gọi a là cạnh của hình lập phương

=> a × a × a = 12 × 3 × a

=> a × a = 36 

Mà 36 = 6 × 6

=> Cạnh của hình lập phương hay chiều cao của hình hộp chữ nhật là 6cm

Thể tích hình hộp chữ nhật hay thể tích hình lập phương là :

12 × 3 × 6 = 216 ( cm3 )

Vậy thể tích hình lập phương và thể tích hình hộp chữ nhật đều bằng 216cm3

Khách vãng lai đã xóa
nguyễn ngọc anh
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lo Do van
17 tháng 3 2021 lúc 20:40

Vì thể tích của lập phương và hình hộp chữ nhật bằng nhau, cạnh của hình lập phương bằng chiều cao của hình hộp chữ nhật, nên diện tích một mặt hình lập phương bằng diện tích đáy hình hộp chữ nhật.

Diện tích một mặt hình lập phương hay diện tích mặt đáy hình hộp chữ nhật là:

12×3=3612×3=36 cm2cm2

Ta có 36=6×636=6×6

Do hình lập phương có 6 mặt đều là hình vuông, mà diện tích hình vuông bằng cạnh nhân chính nó nên cạnh của hình lập phương là 6cm6cm

Vậy thể tích hình lập phương là:

6×36=2166×36=216 (cm3)(cm3)

Vậy diện tích của hình lập phương và diện tích của hình hộp chữ nhật đều là 216cm3216cm3

Giải thích:

- Hình lập phương cạnh aa thì có thể tích là a×a×aa×a×a

Trong đó a×aa×a là diện tích một mặt

- Hình hộp chữ nhật có ba kích thước là a,b,ca,b,c thì thể tích là a×b×ca×b×c

Trong đó a×ba×b là diện tích mặt đáy.

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Nguyễn Thị Mai Phương
22 tháng 2 2022 lúc 15:11
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