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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
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\(^2\)
Độ dài đáy là : 52 + 12 = 64 ( cm )
Diện tích miếng bìa là :
64 x 52 = 3328 ( cm2)
Đáp số : 3328 cm 2
chiều cao.
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)
mình giải rồi mà bạn
vừa người ta báo cáo là phải chờ 2 phút nữa cơ