Đúng ghi Đ , sai ghi S .
Có một hình chữ nhật có chiều rộng 2cm , chiều dài 3cm , chiều cao 4cm và một HLP có cạnh 3 cm
a . Thể tích hình hộp chữ nhật bằng 8/9 thể tích HLP
b . Thể tích hình hộp chữ nhật bằng 9/8 thể tích hình lập phương
K
Khách
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Những câu hỏi liên quan
28 tháng 4 2020
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)
28 tháng 4 2020
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
CM
27 tháng 11 2017
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
4 tháng 3 2023
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
PT
20 tháng 3 2017
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 ( cm3 )
Đáp số : 504 cm3 và 512 cm3
DD
Đoàn Đức Hà
Giáo viên
22 tháng 2 2022
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:
\(6\times6\times6=216\left(cm^3\right)\)
HN
3 tháng 4 2022
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.
TH
2 tháng 3 2022
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
LD
17 tháng 3 2021
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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22 tháng 2 2022
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