Các bn trả lời nhanh lên nhé . Mik cảm ơn trước nhé

Chiều rộng của hình hộp chữ nhật là:

35 × 0 , 6 = 21   ( c m )

Chiều cao của hình hộp chữ nhật là:

21 + 4 = 25   ( c m )

Thể tích của hình hộp chữ nhật đó là:

35 × 21 × 25 = 18375   ( c m 3 )

Độ dài cạnh của hình lập phương là:

( 35 + 21 + 25 ) : 3 = 27   ( c m )

Thể tích của hình lập phương đó là:

27 × 27 × 27 = 19683   c m 3 )

Đáp số:

Thể tích hình hộp chữ nhật:  18375 c m 3

Thể tích hình lập phương:  19683 c m 3

Vậy các số cần điền vào ô trống theo thứ tự từ trên xuống dưới lần lượt là 18375;19683.

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

dễ

 

mà sao bạn làm loằng ngoằng thế

 

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: 

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

a,  diện tích xung quanh là

        8 * 8 * 4 = 256 (cm2)

      diện tích toàn phần là

        8 * 8 * 6 = 384 (cm2)

       thể tích là

        8 * 8 * 8 = 512 (cm3)

b,  tự nghĩ

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

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.

chúc bn học giỏiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

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Gọi cạnh của hình lập phương là a.

Thể tích của hình lập phương là : a × a × a.

Thể tích hình hộp chữ nhật là : 12 × 3 × a.

Ta có :

a × a × a = 12 × 3 × a

a × a = 12 x 3 (chia cả hai phép tính cho a)

Vậy a × a = 2a = 36 ⇒ a = 6.

⇒Cạnh hình lập phương là 6cm.

Thể tích của hình lập phương:

     6 × 6 × 6 = 216 ( cm³ )

Vì thể tích của hình hộp chữ nhật bằng thể tích hình lập phương nên thể tích của hình hộp chữ nhật bằng 216cm³. 

chúc bn học giỏi

quá là khó hiểu

A/Gọi a(m) là chiều dài hình hộp chữ nhật (a>0)

      b(m) là chiều rộng hình hộp chữ nhật (b>0)

      h(m) là chiều cao hình hộp chữ nhật (h>0)

Chiều rộng hình hộp chữ nhật là: b=a : 2 =6:2=3 (m)

Chiều cao hình hộp chữ nhật là: h=b-1=3-1=2 (m)

+Thể tích hình hộp chữ nhật là: V(HHCN)=a nhân b nhân h= 6 nhân 3 nhân 2=36 (m3)

+Diện tích toàn phần hình lập phương là: 6 nhân 10 nhân 10=600 (m2)