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![](https://rs.olm.vn/images/avt/0.png?1311)
a) Hiệu số phần bằng nhau là:
5 - 3 = 2 (phần)
Độ dài đáy là:
28 : 2 x 5 = 70 (cm)
Chiều cao là:
28 : 2 x 3 = 42 (cm)
Đ/S: độ dài đáy: 70 cm
chiều cao: 42 cm
b) Diện tích HBH là:
70 x 42 = 2940 (cm2)
Đ/S: 2940 cm2
![](https://rs.olm.vn/images/avt/0.png?1311)
Chiều cao của HBH tương ứng với cạnh đáy của miếng bìa là
8/15 chia 3/5 = 40/45 [m]
Tích cho mình nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Độ dài đáy hình bình hành là:
28 : 2 x 5 = 70 ( cm )
Chiều cao hình bình hành là:
70 - 28 = 42 ( cm )
b) Diện tích miếng bìa hình bình hành là:
70 x 42 = 2940 ( cm\(^2\))
Đáp số: 2940 cm\(^2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Chiều cao của miếng bìa là :
( 48 - 12 ) : 2 = 18 ( cm )
Độ dài đáy của miếng bìa là :
48 - 18 = 30 ( cm )
Diện tích tấm bìa hình bình hành là :
30 x 18 = 540 ( cm ^ 2 )
ĐS :..................
Độ dài đáy miếng bìa:
(48 + 12) : 2 = 30 (m)
Chiều cao miếng bìa:
30 - 12 = 18 (cm)
Diện tích miếng bìa:
30 x 18 = 540 (cm2)
Đáp số:....
Chúc em học tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có sơ đồ:
Đáy /........../........../........../........../........../
Chiều cao/........../........../........../ 28 cm
a)Chiều cao của miếng bìa là:
28 : (5 - 3) x 3 = 42 (cm)
Độ dài đáy của miếng bìa là:
42 + 28 = 70 (cm)
b) Diện tích miếng bìa là:
42 x 70 = 2940 (cm2)
![](https://rs.olm.vn/images/avt/0.png?1311)
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chiều cao là
54.2/3=36(dm)
diện tích là
54.36=1944(dm2)
gọi diện tích miếng bìa là 1 phần
Phần diện tích còn lại của miếng bìa là
1-1/3-2/3=0(phần)