Question

1 cái hộp dạng hình hộp chữ nhật có chiều dài 20 cm, chiều rộng 15 cm và chiều cao 10 cm. Bạn An dán giấy màu xanh vào các mặt xung quanh và giấy màu đỏ vào hai mặt đáy của cái hộp đó (chỉ dán mặt ngoài). Hỏi diện tích giấy màu nào lớn hơn và lớn hơn bao nhiêu xăng-ti-mét vuông?

Answer 1

chu vi mặt đáy cái hộp dạng hình hộp chữ nhật là:

(20 + 15) x 2 = 70 (cm)

diện tích xung quanh cái hộp đó là:

70 x 10 = 720 (cm2)

diện tích hai mặt đáy cái hộp là:

20 x 15 x 2 = 600 (cm2)

vậy diện tích giấy màu xanh lớn hơn diện tích giấy màu đỏ và lớn hơn số xăng-ti-mét vuông là:

720 - 600 = 120 (cm2)

đáp số: 120 cm2.
 

Answer 2

120 xăng ti mét vuông

Answer 3

Ơ nhưng cái này phải bằng 100cm2

Answer 4

phải bằng 100cm2 .

120cm2 là sai

Answer 5

120 cm2 là đúng nhất

Answer 6

120 cm vuong to tinh rồi  nhớ tk cho tớ nha 

Answer 7

Đáp án đúng là 100cm2

Answer 8

ban dau tien tinh sai,phai bang 120cm2 chu,ban ay viet 70*10=720

Answer 9

theo minh thi bang 100cm2 ban tinh nham con 70nhroian 10

Answer 10

Ra 100

Answer 11

120 đúng 100 %

Answer 12

Bằng 100 xăng - ti - mét vuông bạn à 

Answer 13

120 cm2

Answer 14

000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Answer 15

nè 100 đúng 70 x 10 = 100 chứ

Answer 16

lộn 70 x 10 = 700

Answer 17

100 cm2 là câu trả lời đunggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggg của bài này

Answer 18

120cm2 mới là đúng 

Answer 19

mình ra 100cm2

Answer 20

120cm2

Answer 21

Ko biết

Answer 22

                                                                      Diện tích cái hộp HCN là:

                                                                           (20+15)*2*10=700(cm2)

                                                                       Diện tích 2 mặt đáy cái hộp là:

                                                                            20*15*2=600(cm2)

                                                                      S giấy màu xanh > S giấy màu đỏ là:

                                                                            700-600=100(cm2)

                                                                                          Đs:100cm2

  

Answer 23

100cm2 là đúng 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000% nhé bạn!

Answer 24

Vì sao 70x10=720?

Answer 25

bạn Hikari trả lời sai rồi 

kết quả cuối cùng phải bằng 100 mới đúng chứ 

Answer 26

100cm^{2 nha}

Answer 27

120 🐷🐷🐷🐷

Answer 28

Lời giải:

Bài 1:

Diện tích mặt xung quanh hay diện tích dán giấy màu đỏ là:

   (20+15)×2×10=700(20+15)×2×10=700 (cm2)(cm2)

Diện tích hai mặt đáy hay diện tích dán giấy màu vàng là:

   20×15×2=60020×15×2=600 (cm2)(cm2)

Diện tích giấy màu đỏ lớn hơn số cm2cm2 là:

   700−600=100700−600=100 (cm2)(cm2)

                     Đáp số: 100cm2cm2

Answer 29

vậy bằng bao nhiêu