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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
bài 1 : đổi : 45 cm = 4,5 dm
độ dài đáy hình bình hành là :
36 : 4,5 = 8 (đm)
đáp sôs : 8 dm
bài 2 : cạnh đấy của hình bình hành là :
17 x 2 = 34 (m)
diện tích miếng đất hình bình hành là ;
17 x 34 = 578 (m2)
từ từ, có gì đó sai sai phải là đổi 36dm rồi chia cho 45 chứ
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Ta có:
phân số chỉ chiều dài là:
1/1+4=1/5
Chiều dài là:
75×1/5=15(m)
Độ dài đáy là:
75-15=60(m)
Diện tích là:
60×15=900(m2)
Đ/s:900m2