Vì chiều dài bằng 3/2 chiều rộng, nên ta có thể chia hình chữ nhật thành: 3 x 2 = 6 hình vuông nhỏ bằng nhau. Suy ra: Số đo diện tích của hình chữ nhật là một số chia hết cho 6
Từ 90 đến 100 có 2 số chia hết cho 6 là 90 và 96
Nếu diện tích là 90m2 thì mỗi hình vuông nhỏ có diện tích là: 90 : 6 = 15 (m2). Không có hình vuông nào có số đo là số tự nhiên mà có diện tích 15m2 (loại trường hợp này)
Nếu diện tích là 96m2 thì mỗi hình vuông nhỏ có diện tích là: 96 : 6 = 16 (m2). Suy ra mỗi hình vuông nhỏ có cạnh là 4m
Chiều dài hình chữ nhật là: 4 x 3 = 12 (m)
Chiều rộng hình chữ nhật là: 4 x 2 = 8 (m)
Chu vi hình chữ nhật là: (12 + 8) x 2 = 40 (m)
Diện tích là:90m2
Chu vi là: 40m
Chiều dài là: 12m
Chiều rộng là : 8m
diện tích là:90m2 Chiều dài:12m Chiều rộng:8 Chu vi: 40
diện tích phải là 96m2 sao lại là 90m2
mà chiều rộng là 8m chiều dài là 12m thì 12*8 đâu có bằng 90m2
Chiều dài là 3 phần , chiều rộng là 2 phần và diện tích bằng : 3 * 2 = 6
Từ 90m2 đến 96m2 chỉ có 96m2 là chia hết cho 6.
Suy ra diện tích hình chữ nhật là : 96m2
Diện tích 1 hình vuông nhỏ là : 96 : 6 = 16 ( m2)
Diện tích hình vuông = cạnh * cạnh
Mà 16m2 = 4m2 * 4m2
Suy ra cạnh hình vuông là 4m
Chiều dài mảnh vườn hình chữ nhật là : 4 * 3 = 12 ( m )
Chiều rộng mảnh vườn hình chữ nhật là : 4 * 2 = 8 ( m )
Chu vi mảnh vườn hình chữ nhật là : ( 12 + 8 ) * 2 = 40 ( m )
Đáp số : 40 m
40 m đó mình làm rồi đảm bảo đúng 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